Valid 11/27/14 – 11/30/14 in Staples U.S. stores, online at Staples.com and by phone 1-800-333-3330. Discount will be taken off the lowest priced item. Single cartridges, combo-packs or twin-packs each count as one. Offer not valid on HP and Epson ink and toner or Canon ink. Limit of two at 50% off ink or toner cartridges (or packs) per customer. Offer expires 11/30/14 or while supplies last. Not to be combined with any other offer. Offer is subject to change or cancellation at any time.