Wikipedia
Iretron
iReTron is a recommerce and recycling service company in Los Gatos, California. It allows consumers to sell their old electronics, including cellphones, iPhones, iPods, mp3 players, tablets, iPads, e-readers, calculators and other devices, for free.
The website has users submit the model and condition of their used devices then get a cash offer that the user can either accept or decline. iReTron also repairs,and resells used electronics devices, and offers free shipping.
In 2014, the company appeared on the TV show Shark Tank.