InkGrabber.com offers its HP 21 or 22 Compatible Inkjet Cartridge 6-Pack (4 black, 2 color) for $69.99. Add coupon code “MACHP21″ to your cart to chop it to $50. With $4.95 for shipping, it’s tied with last month’s mention as the lowest total price we’ve seen for this bundle. (Most charge $60 or more for a 4-pack.) It’s compatible with a host of HP DeskJet, OfficeJet, and Photosmart printers.
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