Springtime is a period of renewal – and that often includes new iterations of all your favorite gadgets. Laptops and phones and even game consoles are all getting a new look on the outside and new specs on the inside this year, and you might be tempted to upgrade. But if you do, that leaves the question of what to do with your old model. If it’s still in good working condition, there’s a pretty good chance someone will give you a few bucks for it — here are the best places to make that happen.