This is a weird species IME. There are a few collection points in the lake with metriaclima that tend to go by that trade name, and then there are tank raised ones that it's unclear what species they really are, probably greshakei but after X generations tank raised it's hard to tell. The dominant male in one of my mbuna tanks is a tank raised one; he's beautiful and he's a fantastically kind dictator who keeps everyone in line, but it's nearly impossible to recognize quite what he is. (No, I wouldn't part with him.)
Anyway... I have seen things labeled "red top zebra" at House of Tropicals that are some sort of red top zebra, but when I got them home I found they did not match my male, and he had no interest in the females. I bought the one that I have at Congressional but have not seen them sold there since (to be fair, I do not get there often).
Good luck finding a boy to keep your ladies company!