http://www.staples.com/Products/Spot...80/Default.asp

Buy two 100 packs for $29.94 each. For some reason, you can only add the second pack at the "View Cart" page. Otherwise. it will say "Out of Stock".
Use Code 77375 for $10 off of $50. There is a $20 rebate noted on this page, which applies to only one pack.I guess the rebate will work when you buy two??? Add an eraser or something to get free shipping.