One of our Illithid heroes reported, that he couldnīt trade with the traders of his folk @ Illithid Outpost.
The do not want to sell him anything, so he has to move to Mulrok anytime he wants to trade ...
Perhaps I should change their names, to clear up confusion. They are in reality Slave Traders, not "merchants" per se.
The Illithid store is in town, in the central-south-east section of the city (you know, the one with the funky squid name) . He's a pretty decent store, actually.