Bought two of my three on-line. (Planning another for later this Summer.) Both excellent experiences, and the breeders in both cases had established credibility. In my experience, on-line is about the only way to get quality stock in uncommon animals. Good sources can be few and far between; my favourite breeder for fish is in Hawaii, and the only fish importer I trust is a guy in the Mid-west who hosts weekly on-line auctions. I don't go to shows.
Honestly, I would stay away from BigApple. Besides not being breeders, in the one transaction I know of (cornsnake forum), the snake does seem to have been mis-represented, and they gave the buyer an endless run-around.
The only hassle with on-line orders is that you do have to be home for FedEx.