I found this site that seems to have good deals on livestock. They carry a good variety of fish. They also have corals, clams, and other livestock. There is free shipping for orders over $350. I'm not sure if they offer a discount for large orders, but I can find out if there is enough interest.
They families of fish they carry are:
Angels (dwarf and large), Anthais, Basslets, Batfish, Blennys, Boxfish/Trunkfish, Butterfly, Cardinal, Clowns, Damsels, Dragonettes, Eels, filefish, Frogfish and Anglers, Goatfish, Gobies, Groupers, Grunts/Sweetlips, Hawkfish, Hogfish, Lionfish, Miscellaneous, Parrot Fish, Pipefish, Psedocromis/Dottybacks, Puffers, Rabbitfish, Rays, Scorpions, Seahorses, Sharks, snappers, squirrel fish, tangs, triggers, and wrasses.
If you are interested post a reply here.