The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
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Aquabid is awesome, most people selling their know what they're doing. Check out Liveaquaria too, may not be the best sources for tank sizes and such but I have hear that they have quality fish. The Wet Spot as well, nice fish from there.
The above are good suggestions. Also check out Teds fish room , run by Ted Judy, a hobbyist turned YouTube vlogger and online fish dealer. There's also Msjinkzd , another hobbyist turned vendor. She's great if you're into shrimps or small fish.
I just received my first online fish purchase ever. Got them at Liveaquaria. Came when promised, and they were well packed. I've heard that The Wet Spot is very good also.