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Get Select Compatible Ink for $1 for printer brands such as Brother, Canon, Dell or HP at CompandSave.com. You'll find the individual coupon codes for each cartridge by following this link. For example, get this Brother Compatible LC75XL Combo Pack of 4 Inkjet Cartridges for $1, this is the lowest price you can find by around $12, comparably.
Shipping is $3.99. There is no sales tax (except CA).