This mod adds all options to the shops. I believe I managed to find all of them and make everything 1 Zeni.

The contents of the folder inside just need to placed in {data>system>item}. If there is no working patcher, then remove
all but loose_files.xml from XV2PATCHER | EPatches. Otherwise, install
the patcher first, then the mod.

There is a potential bug with the Skill Shop. I don't know what it is, but its causing crashes. If you encounter that, or know anything about it, please fill me in and I can get it fixed.