From the coupon:

"- Not valid on purchase of calendars, planners, desktop or laptop computers, tablets, netbooks, computer media, batteries, consumer technology, printers, fax and copier machines, HP ink and toner, appliances, safes, shredders, custom printing orders placed online, services, promotional products, Beats Audio™ products, Amazon Kindle® products, gift cards, cell phones and cell phone services, phone cards or postage stamps"

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