The merchants aren't human.
A cabal of devils (perhaps in disguise) buy and sell magic for their own nefarious purposes.
A gang of Duergar have goods from the underdark to trade.
A semi-civilized Titan carries a little tent full of goodies on his back.
In my 3E campaign, I've used devilish merchants more than once. It's entertaining for me when the players look over their new purchases and say, "Wait, did this come from Hell?"
A cabal of devils (perhaps in disguise) buy and sell magic for their own nefarious purposes.
A gang of Duergar have goods from the underdark to trade.
A semi-civilized Titan carries a little tent full of goodies on his back.
In my 3E campaign, I've used devilish merchants more than once. It's entertaining for me when the players look over their new purchases and say, "Wait, did this come from Hell?"