Look into f1. They're half the price or even cheaper and I've seen f1 polys go for 15-30 a piece...
What about buying them as a fry? They'll grow in no time with the tank you have...
I like to breed WC only and i dont believe there are any F1s of the poly im talking about. Correct me if im wrong though, the poly is Petrochromis polyodon Chinga Congo Bright Yellow. I dont care about the price i like to start with wild bloodlines. That way i know all the lineage and can track it all. I am very meticulous about that. I had a very successful business years ago breeding top quality cichlids and am trying to get back to that. I will not taint my startup with F1s.