The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
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I've ordered and shipped thousands of fish over the years through various sites like http://www.aquabid.com/ with very few casualties, keep in mind your local fish store probably has their fish delivered through the mail. They key is proper shipping and acclimation methods and it's no more of concern that walking into your LFS and picking out fish. I'm not sure what your looking for but my 2 favorites are: