Canon controls the prices that authorized retailers can sell cameras for, so be careful. One scam I saw yesterday was sellers saving the camera would be shipped without a battery due to USPS postal regulations.
I run a online business, and US postal regulations do indeed now prohibit shipping items with LI-on batteries for INTERNATIONAL shipments. This means that if its a US business, they are scamming you, or they are getting the camera sent to them by mail from a international seller.
There are a ton of scams.
There are good reliable sellers on ebay, I've bought from Adorama, Norman Camera, and a few others.