HP Officejet 940XL Black Printer Ink Twin Pack High Capacity Exp 11/17 #366641 | eBay
HP Officejet 940XL Ink Cartridge Black C4906AN#140 - Best Buy
Amazon.com: BINKSYLER 940XL Ink Cartridges Replacement for HP 940XL 940 XL Use for HP Officejet Pro 8000 8500 8500A 8500A Plus Printer (1 Black,1 Cyan,1 Magenta,1 Yellow) 4 Pack : Office Products