I went through this very thing about 10 years ago...Tanganyika is such a cool place the fish very unique, but it's *really* difficult to find much. In particular, I always wanted a big school of cyprichromis (sp?) to take up the upper levels of my tank....
Julis were my favorite, I had pairs of several species of them and they had such personality!
Well, take it back, my ultimate favorite were my gold ocellatus shell dwellers. (iirc these were Tanganyikans)... Such unique behavior (want to catch them? pick up their shell! You'd see a tiny tail poking out)...one of mine would come after my hand, the gravel vacuum and anything else that got near his shell...he and another male used to play bluffing games, puffing up then *shooop* back to their own shell they would zip.
Ironically now one of my local stores, that at the time was moving more into reef, has a better selection of cichlids than it used to (still only a couple/few tanks of tanganyikans)...and I'm doing planted community tanks!
At this point I'm more willing to try internet ordering than I was then, that's probably my only suggestion.