A 20lb. case of 5000, 8 1/2" x 11" Staples Multipurpose Paper drops from $51.99 to $14.99 using this $37 Pre-Paid VIsa, mail-in Rebate at Staples.com. Even better, the shipping is free and rewards members can get 5% back, which can be used on future purchases. This is the best price we could find on this amount of copy paper by $12. These standard sized sheets work well in both laser and inkjet printers. Your rebate card will arrive within 4-6 weeks, and there is a limit of 2 cases at this price. Sales tax is charged in most states.