Amazon.com: HP 87A Black Toner Cartridge | Works with HP LaserJet Enterprise M506 Series, HP LaserJet Enterprise MFP M527 Series, HP LaserJet Pro M501 Series | CF287A : Office Products
Black High Yield Toner Cartridge Compatible with HP LaserJet Pro M501dn (N2871)
2pcs 9k Cf287a 87a Toner Cartridge Chip For Hp Laserjet Pro M501 M501dn M506 M506dn M506x M506n M527 M527dn M527f Printer Reset - Cartridge Chip - AliExpress
2PK High Yield CF287X 87X Toner Cartridge for HP LaserJet Pro M501 M501dn M501n | eBay