The Swap-O-Matic

Check it oouuut! A vending machine in which you donate items to receive items! Watch the video here.
"To use the Swap-O-Matic, you register with an email address using the machine's touchscreen interface. New traders start out with three swapping "credits." Donating an item earns additional credits, which can be redeemed for anything else in the machine." Read the full article here.