http://www.usa.canon.com/html/canonindex.html
At the end of this site it has a place where you can contact them. I'd be asking them questions.
When a camera cost anywhere from $275.00 and up, depending on where you buy it (shop around) and someone wanted to sell it for $80.00, a big red flag would go up as far as I was concerned, especially since they could sell it for more. I would ask the seller if I could take the camera down to Circuit City to have it checked out first. I have a feeling something is seriously wrong with that camera. Good luck.