All of the local stores that sponsor ARC (Aqua-Dome, RCA, and AquaTek) have frag tanks with great prices on various corals. I have purchased items from all three and have been extremely happy. From the Dome alone I have gotten zoas, gorgonian, orange brains, etc from their frag tank.
As for online, you will just have to shop around. But shipping is normally expensive unless you buy a lot, or get involved in a group order (such as Mr. Cob's current ARC only group order).