can u buy the camera on ebay and use the amazon rebate?
No, but it's basically a manufacturer rebate, there are versions for amazon, b&h, etc. These guys seem to have 40K ebay feedback so you should be able to trust the rebate.
It's actually a really good deal, if i didn't already have a t3i i'd be all over it. Sell the printer for $150 and you've gotten a t3i for $350, which is a great price, and you've gotten at least $8 in cc rewards and $16 in ebay bucks...