From Office Depot Web Site...
Office Depot store. As a member, you'll get $2 back in Recycling Rewards for each cartridge recycled, up to 10 cartridges per month. You can recycle additional cartridges, but Recycling Rewards will only be issued on the monthly limit. Recycling Rewards will be granted when you make qualifying Office DepotŪ purchases and will not exceed the amount of your total qualifying Office Depot purchases made within a Reward Period. (Qualifying purchases exclude taxes; delivery fees; postage stamps; prepaid gift, debit, phone or service cards; and purchases made with Office Depot Rewards and Merchandise Cards/Certificates.) We reserve the right to decline acceptance of visibly damaged cartridges for recycling. Please allow up to 6 weeks for your Recycling Rewards to post to your account after qualifying purchases are made. Recycling Rewards will be issued with your Rewards Certificate when you earn $10 or more in Rewards. Subject to Program Terms and Conditions.



So you have to purchase something and then get your points to spend 6 weeks later?