Amazon.com: (Pack of 2) GTS Compatible Replacement for HP CF287X 287X 87X Toner Cartridge (11,000 Pages, 2 Pack) for HP Enterprise M506 M506n M506x M506dn MFP M527 Series m527c Pro M501n M501dn
1-Pack 87X Toner Cartridge Compatible for HP CF287X 87X CF287A 87A LaserJet Enterprise M506 M506n M506x M506dn MFP M527 Series Pro M501n M501dn High Yield Black Printer Ink - Walmart.com
2PK CF287A 87A Toner Cartridge For HP LaserJet Pro M501 M501dn M501n Printer | eBay