So i will weigh in here, Todd is 100% correct Florida fish farms and most distributors are selling mix lots of tiny Africans labeled as mix not necessarily hybrids but on occasions i do see some hybrids in these mix lots..they sell these to independent pet shops at a small fraction of the price you are paying for these guys and since they come in lots of 25 or more they are even cheaper for those pets shops to acquire..
And like Todd said as well you are seeing zebras, auratus, chipokea, johanni, more of your melanochromis and these dudes get pretty mean and reach about 6inches a nightmare waiting to happen to a newcomer in african cichlids..
The best advice has been given out research what you want and set out to do just that a good place to start on the info for african cichlis would be cichlid forum.com