YYMV on this, but at my local Electronics Boutique, I was able to trade in a few games that would normally trade in for about $4 each - but came to a trade-in value of $10 each because I applied them to the pre-order of the Halo2 Limited Edition. I slapped $5 cash down to add to the pre-order and whammo, more than half of my purchase is pre-ordered because I traded in some old titles that were gathering some dust.