How to save on your printer paper

For those of you who do not know. You can bring in your empty used printer cartridges to Office Depot and they will give you a FREE ream of paper!
I always save my cartridges to bring to them.
Heck! I don't even buy my printer cartridges from them anymore! I found that they are a few dimes cheaper on Base! I haven't purchased plain printer paper in years!
I hope this saves some of you some extra money!