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Those Tilapia discolor do look interesting, can't say I've ever seen those before. Heterochromis multidens also seem to be at a much more resonable cost compared to what they go for here in the states.
Like everyone said, no way to justify the cost for just a couple of fish. For what it's worth these are the tilapia they had listed as available:
Tilapia brevimanus
Tilapia deckerti
Tilapia louka
Tilapia sparrmanii
Tilapia sp. Mamfé
Tilapia snyderae
I've seen them on one of the lists out of the Netherlands along with some other interesting fish, but like you said importing them is a whole other matter.