i bought my aqua-cultured orange tipped elegance from ebay - mainly because it was 70-80% cheaper than anywhere else. she arrived looking pretty freshly cut and had some guts hanging out. i emailed the seller who said that it'd been cut for at least 2 weeks and assured me that it was very hardy.
well, its been 62 days and she's still alive and looks to be doing well.
a lot of the big websites sell on ebay as well - however if you're buying from a "no-name" seller, i would look at his other stuff & feedback and then gauge your risk tolerance. but generally, i feel with the bidding wars and everyone buying from one seller to offset shipping - you end up not saving that much unless its something that you just cannot find or if you're planning to buy only 1 item.