What's it good for? If it was off an iPad I'd buy it.
"This coupon may be used only by calling 1-800-MY-APPLE. It may not be used for purchases made at an Apple Store retail location, at a reseller, via the iTunes store, via specialized online stores such as those for education, business, or government, via an Apple Store in countries other than the country in which the coupon was offered, or in conjunction with another discount, such as an education discount. It may not be used to purchase iPhone, iPad, Apple TV, Apple Gift Cards, iTunes Store gift cards, AppleCare Protection Plan (APP) agreements, or software downloads, such as QuickTime Pro, iWorks, or AirPort Enabler. This coupon may be used only once, and after it has been entered at the Apple Store, the Promotion Code is no longer valid. This coupon is not transferrable."