Tonight I ran to Office Depot to pick up some supplies for my room. My dad saves all of his old ink cartridges from work (he owns his own business) and I usually take them up to OD or Staples to cash them in for $3 off coupons.
Well, at Office Depot, you can use up to 3 $3 coupons at a time- so $9 off your purchase. Tonight I checked out twice, and for $2.24 I got:
100 file folders
2 sets of A-Z dividers
2 desk trays
It's also pretty green- recylcing your ink and then it's frugal getting something in return :)