I've bought most of my fish online! Lets see, I reccommend
users by the name of Severum Mama or HN1, pm one of them.
Bobstropicalplants.com-he sells fish too
Oddballfish.com-gorgeous rams and some really cool rainbowfish
Liveaquaria.com-bought lots of plants, i assume they have decent fish too.
Aquabid is awesome. You can pick up some awesome steals there. Check it out.