When your printer cartridge runs out of ink, instead of throwing it
away, recycle it and get something for it. Many retailers (i.e. Office
Max and Office Depot) will give you an incentive to donate it to them
such as a free package of paper or a few dollars off a new ink
cartridge. Considering they refill the old cartridges, repackage them,
and sell them for significantly cheaper than the name brand ink, you
can save even more by buying these.

So don’t just throw your empty ink containers away, help everyone
(including yourself) by recycling.