I second what RiverView said. I bought a $950 dryer for $500 because it had scratches on the front and side. My clothes don't seem to care about the scratches, so neither do I.
They also have dryers for sale for much cheaper than $500, and they all carry factory warranty.
For actual used dryers, you might try Craig's list. I've personally never had any luck with it, but I know many people who have.