How agile are you? Not as agile as you'll be when you're high on PARTY, THE GREATEST DRUG OF ALL TIME! But be careful, the comedown will kick you in the face like a red-ribbon boring horse!
Find a WHOLE BOX of the stuff, confiscated from junkies and in a badly-locked box in the Followers Of The Apocalypse's Old Mormon Fort. Take it, get an UNREASONABLE stat boost, but be prepared to deal with the positively vicious addiction effects. Even that chem-peddler from Freeside doesn't keep this stuff in stock, it's "Too hardcore" for him. Of course, that doesn't mean he won't buy any spares off you.