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
Amazon.com: Aztech Compatible Toner Cartridge Replacement for HP 87A CF287A 87X CF287X for Enterprise M506 M506dn M506n M506x Pro M501 M501dn M527 M527dn Printer (Black, 1-Pack) : Office Products