The best thing about all of these sites is that in a few minutes you can search all of them and find out how much money you can get for something that was sitting in a drawer collecting dust. They may not make you rich, but it beats having them clutter up your home.
Tip: To get the best price, sell well before you expect the new version of your electronic device to come out. Apple, for example, generally releases new generations of its products a year after the latest one has come out, so selling close to a new releases date probably won’t get you as much money as if you had sold it earlier. The company is very good at not setting firm release dates too early so they won’t hurt sales of its existing products.