Next-generation console launches don't come along very often. But when they do, there's a sudden sinking realisation that these shiny new wonder-machines cost a lot of money. And in that desperation, particularly in our recession-rocked world, many perfectly good things are being sold to pay for them. Great things, even. So whether you're investing in collectibles or just picking the bones of the current-gen carcass, there's a killing to be made right now. On eBay.