Where can I buy tropical freshwater fish online?

Some marketplaces include but are not limited to; LiveAquaria, AquaBid, Petco (yes you can order online to be shipped to a store or even your own home), and if you put the request in - possibly here if someone has whatever you are looking for.

There are so many places online that sell live fish and other animals but I never could bring myself to buy online, at least nothing other than shrimp, snails, and plants. The shipping is usually very expensive and you have to worry about the stress during shipping.