Staples - Deal Scenario on Ink

Ok, this may not apply to everyone, but if you happen to have a Lexmark printer, this is a good week to stock up on some ink at Staples.  Right now all Lexmark ink and toner gets 20% back in rewards.  Then bring in your empty cartridges for an extra $3 (you can do this anytime if yours aren't empty yet) + use this $10 off $50 coupon and that makes for a pretty good deal. 

I bought a 2-pack (black and color ink) for $64.99.  I'll get $13 back in rewards + $6 for my empty cartridges.  Plus the $10 off coupon.  After rewards and coupon, it comes out to $17.99 a cartridge.  Not bad!