At shopping malls all over the country, a new type of ATM is popping up -- ecoATM. It works just like a regular cash machine with one exception: It buys used consumer electronics like cellphones, smartphones and tablets from you for cash. It's simple to use: The machine examines your device and tells you the highest price it can pay you for it. You have the option to sell it and get cash on the spot or reject the offer and get your item back. To find an ecoATM near you, visit ecoatm.com.