Pens, Tape, and Labels. Limit two per each member of the rewards program.
Buy with $$ and get the same amount back to use again at office depot in the form of a rewards certificate.
So, if you know your going to buy something from OD, this is like 50% off (you get to spend your money twice). If you need tax software which costs about $40, you can get something free along the way —- its all in how you look at it.