This is a list of all the vendors with the items that they sell. Just Ctrl-F the item you're looking for and it should be at that vendor. If it is not at that vendor, please let me know so I can look into it.

Arron (Act 1)
Duellist Cloak
Mantle of Heroic Verse
Destructive Grips
Celestial Boots
Corellon's Band
Tactician Boots
Wave Gloves
Breastplates of the Ancient Sentinel
Shadowstriker's Hood
Planar Amulet
Planar Ring
Seraphim's Staff
Eclipsed Band
Infernal Cape
Scroll of Dessicate
Conjurer's Boots
Evoker's Ring
Spider's Fang
Boar's Tusk
Wolf's Bite
Monkey's Paw
Bloodspiller

Dammon (Act 1)
Ring of the Stormcaller
Stormcaller's Vestments
Mage Knight's Mantle
Wild Cloth
Hauberk of Sacred Might
Serene Mantle
Solar Breastplate
Lunar Staff
Tactician Mantle
Gladiator's Helm
Vortex Gloves
Necklace of the Ancient Sentinel
Dominator's Ring
Corsair's Tricorne
Heavenly Sandals
Heavenly Amulet
Harbinger's Grips
Raven's Beak
Bear's Might
Crocodile's Maw

Auntie Ethel (Act 1)
Predator's Amulet
Duellist Boots
Serene Band
Solar Mantle
Verdant Amulet
Lunar Boots
Lunar Ring
Celestial Grips
Gladiator Gauntlets
Phoenix Boots
Grandmaster Gloves
Grandmaster Ring
Dominator Boots
Dominator Amulet
Guardian's Helm
Shadowstriker's Amulet
Huntmaster's Hood
Trickster's Boots
Corsair's Gloves
Infiltrator's Pendant
Seraphim's Sandals
Infernal Gauntlets
Harbinger's Crown
Dancer's Ring
Evoker's Cloak
Evoker's Boots
Shaper's Ring
Badger's Claw
Eagle's Talon
Elk's Antlers
Panther's Pounce
Tiger's Maul
Stallion's Hoof
Falcon's Eye
Glaive of Dis
Blade of Minauros

Grat (Act 1)
Rampaging Boots
Wild Mantle
Cloak of Sacred Might
Aristocrat's Crown
Minstrel's Boots
Signet of Heroic Verse
Artisan's Helm
Artisan's Gloves
Verdant Cloak
Verdant Boots
Mycelium's Might
Umbral Hood
Umbral Tunic
Forest Stalker's Armor
Huntmaster's Mantle
Lethal Amulet
Corsair's Parley
Seraphim's Gloves
Wyrm Grips
Abyssal Boots
Shaper's Gloves
Viper's Venom
Hornet's Sting

Roah Moonglow (Act 1)
Wild Pendant
Aristocrat's Tunic
Minstrel's Grace
Duellist Armor
Artisan's Pendant
Serene Sandals
Solar Gloves
Guardian's Band
Retributor's Gauntlets
Retributor's Marchers
Forest Stalker's Hood
Huntmaster's Boots
Wyrm's Stride
Eclipsed Steps
Infernal Signet
Abyssal Helm
Helm of the Dark Pact

Blurg (Act 1)
Stormcaller's Amulet
Mage Knight's Gauntlets
Mage Knight's Helm
Colossus Mantle
Colossus Ring
Wild Gauntlets
Aristocrat's Gloves
Bolt of the Gallant Muse
Minstrel's Gloves
Minstrel's Vest
Destructive Ring
Corellon's Sight
Tactician Amulet
Tactician Ring
Gladiator's Amulet
Grandmaster Circlet
Umbral Gloves
Dominator's Gauntlets
Guardian's Gauntlets
Guardian's Greaves
Retributor's Charm
Trickster's Veil
Lethal Shroud
Lethal Vest
Infiltrator's Shroud
Infiltrator's Band
Wyrm Mantle
Eclipsed Staff
Harbinger's Robe
Dancer's Sandals

Derryth (Act 1)
Stormcaller's Mantle
Mage Knight's Ring
Predator's Ring
Colossus Helm
Wild Greatclub
Ring of Sacred Might
Lunar Gloves
Grips of the Fungal Bloom
Celestial Mantle
Corellon's Grips
Gladiator's Armor
Vortex Circlet
Terran Helm
Phoenix Vestments
Grandmaster Amulet
Forest Stalker's Ring
Shadowstriker Mantle
Planar Circlet
Trickster's Ring
Lethal Ring
Lethal Gloves
Corsair's Mantle
Infiltrator's Cap
Seraphim's Vestments
Harbinger's Mantle
Band of the Dark Pact
Evoker's Diadem
Shaper's Boots
Tines of Avernus
Flames of Phlegethos

Omeluum (Act 1)
Stormcaller's Boots
Predator's Mantle
Rampaging Mantle
Rampaging Amulet
Ogre's Javelin
Gloves of Heroic Verse
Artisan's Hammer
Solar Amulet
Destructive Helm
Vestments of the Fungal Bloom
Treads of the Fungal Bloom
Celestial Staff
Terran Cloak
Phoenix Crown
Sentinel Gauntlets
Planar Gloves
Heavenly Mace
Abyssal Grips
Harbinger Boots
Grips of the Dark Pact
Dancer's Garb
Conjurer's Circlet
Conjurer's Robe

A'jak'nir Jeera (Act 1.5)
Battleaxe of Sacred Might
Warhammer of Sacred Might
Artisan's Sabatons
Serene Medallion
Verdant Ring
Ring of the Ancient Sentinel
Guardian's Drape
Planar Mantle

Esther (Act 1.5)
Mage Knight's Boots
Rampaging Helm
Duellist Cap
Duellist Locket
Destructive Mail
Cap of the Fungal Bloom
Tactician Gauntlets
Forest Stalker's Bow
Silent Kiss
Undercity Slicer
Shaper's Helm
Shaper's Robe

Barcus (Act 2)
Boots of Sacred Might
Serene Aegis
Serene Gloves
Serene Halo
Pendant of the Fungal Bloom
Phoenix Mantle
Grandmaster Boots
Umbral Cloak
Sentinel Mantle
Forest Stalker's Grips
Shadowstriker Vest
Maze's End
Instability of Malbolge

Dammon (Act 2)
Predator's Cap
Artisan's Drape
Verdant Gloves
Lunar Amulet
Celestial Crown
Terran Boots
Wave Cloak
Wave Crown
Retributor's Mantle
Shadowstriker Grips
Huntmaster's Pendant
Lethal Boots
Boots of the Dark Pact
Amulet of the Dark Pact
Serpent's Sixfold

Talli (Act 2)
Wild Headdress
Boots of Heroic Verse
Dawnbringer
Morning Sun
Celestial Amulet
Gladiator's Sandals
Vortex Boots
Phoenix Grips
Planar Longbow
Trickster's Blade
Corsair Boots
Infernal Treads
Infernal Amulet
Evoker's Amulet

Araj Oblodra (Act 2)
Predator's Garb
Predator's Gauntlets
Rampaging Gauntlets
Aristocrat's Boots
Lunar Cloak
Corellon's Striders
Terran Plate
Wave Vest
Umbral Boots
Dominator's Plate
Retributor's Helm
Huntmaster's Ring
Infiltrator's Boots
Wyrm Amulet
Heavenly Mantle
Heavenly Diadem
Infernal Morningstar
Frost of Stygia

Lann Tarv (Act 2)
Colossus Amulet
Helm of Sacred Might
Minstrel's Amulet
Circlet of Heroic Verse
Solar Ring
Destructive Boots
Tactician Helm
Retributor's Plate
Shadowstriker's Ring
Huntmaster's Gloves
Trickster's Vest
Trickster's Gloves
Wyrm Rod
Eclipsed Hood
Cuirass of the Dark Pact
Cloak of the Dark Pact
Conjurer's Gloves

Roah Moonglow (Act 2)
Colossus Gauntlets
Gauntlets of Sacred Might
Minstrel's Mantle
Edge of Heroic Verse
Aegis of Heroic Verse
Corellon's Mantle
Dominator's Helm
Seraphim's Crown
Seraphim's Amulet
Wyrm Ring
Eclipsed Robe
Heavenly Gauntlets
Abyssal Locket
Dancer's Veil
Dancer's Amulet
Dancer's Gloves
Legacy of Maladomini

Exxvikyap (Act 3)
Stormcaller's Circlet
Stormcaller's Gauntlets
Stormcaller's Staff
Colossus Boots
Minstrel's Crown
Bladesong
Destructive Stormbringer
Gladiator's Ring
Vortex Vest
Trickster's Amulet
Abyssal Band
Dancer's Circlet
Conjurer's Ring
Gold Longsword
Silver Halberd

Ferg Drogher (Act 3)
Rampaging Ring
Bloodrage
Minstrel's Ring
Lunar Vestments
Champion's Broadsword
Vortex Cloak
Dominator's Maul
Forest Stalker's Talisman
Planar Plate
Deathbite
Abyssal Cloth
Copper Hand Crossbow

Entharl Danthelon (Act 3)
Artisan's Masterpiece
Artisan's Plate
Circle of the Fungal Bloom
Umbral Ring
Greaves of the Ancient Sentinel
Crown of the Ancient Sentinel
Dominator's Cloak
Guardian's Plate
Trickster's Cloak
Pendant of the Kraken
Infiltrator's Tunic
Heavenly Ring
Infernal Crown
Abyssal Mantle
Scroll of Greater Bear's Endurance
Scroll of Greater Bull's Strength
Scroll of Greater Cat's Grace
Scroll of Greater Eagle's Splendor
Scroll of Greater Fox's Cunning
Scroll of Greater Owl's Wisdom
Conjurer's Mantle
Shaper's Amulet
Abyssal Scream

Arkleia (Act 3)
Predator Boots
Breastplate of Heroic Verse
Solar Boots
Solar Circlet
Verdance
Lunar Diadem
Corellon's Pendant
Gladiator's Mantle
Wave Boots
Harmony of the Ancient Sentinel
Bastion of the Ancient Sentinel
Guardian's Edge
Guardian's Bastion
Guardian's Locket
Retributor's Glaive
Forest Stalker's Mantle
Shadowstriker's Boots
Eclipsed Pendant
Harbinger's Rapier
Evoker's Gloves
Scroll of Fire Storm
White Battleaxe
Matalotok

Helsik (Act 3)
Colossus Garb
Destructive Cloak
Celestial Robes
Terran Gauntlets
Forest Stalker's Boots
Shadowstriker Bow
Corsair Tidecutter
Corsair Seaslicer
Eclipsed Gloves
Infernal Blazer
Evoker's Robes
Red Greatsword
Heartcleaver

Dammon (Act 3)
Mage Knight's Plate
Duellist Ring
Celestial Ring
Tactician Edge
Tactician Resilience
Retributor's Ring
Harbinger's Pendant
Scroll of Colossify
Blue Scimitar

Mystic Carrion (Act 3)
Wild Ring
Locket of Sacred Might
Pendant of Heroic Verse
Artisan's Band
Verdant Crown
Verdant Vest
Mantle of the Fungal Bloom
Corellon's Hauberk
Corellon's String
Grandmaster Cloak
Huntmaster's Armor
Eclipsed Mantle
Brass Spear

Sorcerous Sundries (Act 3)
Mage Knight's Amulet
Rampaging Furs
Lifebloom
Destructive Amulet
Planar Boots
Big Game Hunter
Lethal Mask
Seraphim's Mantle
Wyrm Crown
Harbinger's Ring
Blackrazor
Wave of Sorrow

Gloomy Fentonson (Act 3)
Aristocrat's Veil
Aristocrat's Band
Umbral Amulet
Infiltrator's Gloves
Shaper's Cloak
Black Sickle
Green Longbow

Fytz (Act 3)
Mage Knight's Royal Bulwark
Mage Knight's Royal Blade
Wild Boots
Aristocrat's Medallion
Duellist Gloves
Serene Mail
Tactician Cuirass
Grandmaster Robes
Corsair's Rigging
Seraphim's Ring
Wyrm Vestments
Heavenly Armour
Bronze Trident
Staff of Fraz-Urb'luu
Cania's Frostbite