Ask Engadget: best way to sell my old gadgets?

We know you've got questions, and if you're brave enough to ask the world for answers, then here's the outlet to do so. This week's Ask Engadget inquiry is from Todd, who has fallen out of love with his aging gadgets and wants to swap 'em back for some money. If you're looking to ask one of your own, drop us a line at ask [at] engadget [dawt] com. "When upgrading your kit, you'll naturally want to sell your old hardware. eBay has been the go-to place to auction your items, but lately its newer p...