Yes on the forums, on e-bay however for some reason 560s are really expensive, so he might as well get the most of it. Currently the cheapest used 560 on ebay is ~$97. There is a $88 560ti suprisingly enough but it's probably going to be gone in a matter of seconds.
Ebay fees are 10%. If it goes for $80 he'll only get $72 of that.
$97 buy it now? Yeah that's why it's still there. There's probably a couple $150 buy it now's too. You can ask whatever you want that doesn't mean it's going for that much.
Watch the auctions. There's some 560 Ti buy it now's for $100. A Ti is only going for $90-95 on ebay auction, $80-85 on the forums. It only makes sense that a regular 560 is worth less.