Office Depot Info
Office Depot has a loyalty program called workliferewads which you sign up for here. You will earn a rewards certificate if you have earned at least $10 by the end of the rewards period. To learn more about their loyalty program you can check out their FAQ page here.
You can sell Office Depot your empty ink and toner cartridges! They pay $2 a cartridge which will go on your workliferewards card.