We go through a lot of printer paper while homeschooling. We go through quite a bit of ink too. Did you know Office Depot will give you a ream of recyclable paper in exchange for an old ink cartridge?
When I cannot refill a cartridge anymore, I put it in a Ziploc bag, which I keep in my purse. The next time I pass by an office depot, I go in for my free paper… That is often all I get, unless they have a good discount in the clearance area.