Christmas is always a boom time for on-line console sales at... "That on-line auction site".
Competitive prices, and talking it up work a treat, maybe worth picking up a discount copy of resistance 2 after its release and bundling it, add on your expenses.
Make sure you confirm with a courier how long it'll take for postage, then post at least that far in front of Christmas, with something in the description along the lines of "Will deliver in time for Christmas". That's what I'd do.