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Overstock has a great selection of HP Inkjet Print Cartridges in either black or color for only $14.99 each. The popular HP 94 Black Cartridge and the HP 95 Tri-Color Cartridge are both at this price point, despite being considerably more at Office Depot. Take a look around, these are just examples and they have dozens of others at this price point. Shipping is $2.95 and there is no sales tax (except IN, UT). Also, Buy.com has many "twinpacks" at very good prices.