If you haven't paid yet, I think the $81.00 difference is worth an unpaid strike against me as you can get a couple of those without getting in trouble. Ask the seller to let you off the hook and explain you hit an extra key and if they don't forgive you, just don't pay.
I assume you bought it on eBay, I can't find a completed listing where one comes out with a $90.00 bid?
Can you post your purchase link or image?












