I'd second niff... Those of us who have to beg warps love not having to leave back to town just for more gj/meats, it's enough of a pain that I'm not all that picky about the price either- unless it's waaay over charging it's worth it for me to not waste time going back to pront and harassing those poor priests for warps(I always feel bad about this, my other primary char is a hp)
In niff you could expand to bgems and pots too. Someone selling whites outside niff would be my best friend ever, my homun eats them there.
But there's not that many alches training in niff, and maybe the others are less lazy and more frugal than me and wouldn't go for it.