Epson 788XXL Black Ink Cartridge - Original, Inkjet, Extra High Yield, up to 4000 Pages, Epson DURABrite Ultra, for WorkForce Pro WF-5110, WF-5190, WF -5620, WF-5690 - T788XXL120 at TigerDirect.com
Amazon.com: Epson 79XL - Black - Original - Ink Cartridge - for Workforce Pro WF-4630DWF, WF-4640DTWF, WF-5110DW, WF-5190DW, WF-5620 : Office Products