You have to purchase a $25 off $75 coupon on ejunkie. They're only about 1 - 3 dollars each.
You must be registered for see links
If you apply the coupon and it says it worked but doesn't take off $25 then go ahead and pay for it. After you pay for it call staples customer service and say your coupon didn't work and they'll refund the $25 to you.
I might have an extra coupon that you can use.. I'll look. May not work because I bought it so long ago.