Prices really vary by location, I've seen F1 Moba go for $30 a pop(not often sometimes less for quanity) from local breeders. If your not going WC try to find a local breeder they will give you the best deal for the money and you know you can get quality fish.
A site I'll recommend for Frontosa is cyphos.com, hate to post about another forum but you'll probably find much more info there being dedicated to fronts. Search thier pictures to find good examples of the color of different varients.
Personally I like mpimbwe and moba.