Staples coupon: $20 off $100 or more (updated)

Staples cuts $20 off orders of $100 or more via any of the coupon codes listed below. In addition, 5% of your purchase price will be donated to the charities mentioned next to that coupon code. It's the best dollar-off coupon we've seen from Staples since March. Sales tax is added where applicable. Computers are excluded. Coupons end July 29. The codes:

• Code "54835", to benefit Ashoka
• code "64335", to benefit Hispanic Heritage Foundation
• code "72382", to benefit Boys & Girls Clubs of America
• code "89750", to benefit Earth Force