2PK High Yield CF287X 87X Toner Cartridge for HP LaserJet Pro M501 M501dn M501n | eBay
Amazon.com: HP 87X Black High-yield Toner Cartridges (2-pack) | Works with HP LaserJet Enterprise M506 Series, HP LaserJet Enterprise MFP M527 Series, HP LaserJet Pro M501 Series | CF287XD : Office Products