Now that the kids are back in school with fully stocked desks and backpacks, it's time for you to turn your attention to the supply cupboards at your office. Fill 'er up this week at OfficeMax with these great sitewide coupons! In addition to automatic free shipping on all orders of $20 or more, use coupon code 20SAVE to save $20 on orders of $150 or more, coupon code 30SAVE for $30 off $200 or more, or coupon code 40SAVE for $40 off $250 or more. All three coupons expire 09/28/2013.