I have purchased several cameras from this site:-

http://stores.ebay.co.uk/Canon-Outlet_Canon-Digital-Cameras_W0QQcolZ2QQdirZQ2d1QQfsubZ2QQftidZ2QQtZkm

It's the official Canon site - refurbished with the same guarantee as a new camera, and probably in the price range you are talking. I've never had a spot of trouble with any of them.
John Barden