I would agree with Jim (notho2000), where I live most LFSs will give credit toward fish food, or other fish. Usually to the tune of about 1/4 to 1/3 the retail price.
You could also take them to one of your local fish clubs, and check if someone there would like to trade you for some fish you haven't tried yet, or simply BAP them (Breeders Award Program).
Many of the fish I have, have come from trades with other members of my local club, and after a few spawns, I will often trade my spawning pairs, for another spawning pair of fish that haven't bred for me.