Amazon.com: EPSON 822 DURABrite Ultra Ink Standard Capacity Black & Color Cartridge Combo Pack (T822120-BCS) Works with WorkForce Pro WF-3820, WF-3823, WF-4820, WF-4830, WF-4833, WF-4834 : Everything Else
Epson DURABrite Ultra Ink T252XL High-capacity Black ink cartridges
Amazon.com: EPSON 812 DURABrite Ultra Ink High Capacity Black & Standard Color Cartridge Combo Pack (T812XL-BCS) Works with WorkForce Pro WF-7310, WF-7820, WF-7840, WorkForce EC-C7000 : Office Products