I'd lower your price a little because Walmart sells them sealed in the box new for $69. Unless you're tossing in a TV tuner or something else with it no one will buy it for that price unless you find someone wanting to import it into a country that it's not sold in.

I'm not interested (have one), so I'm not haggling when I say this. $10 off on a used product seems a bit light. You may end up having to drop down the price to $70 or maybe you can get away with $80.

Personally, if I see a used product that is only $10 or $15 off, I'll pay the extra for new.