Amazon.com: HP 55A Black Toner Cartridge | Works with HP LaserJet Enterprise 500 MFP M525 Series, HP LaserJet Enterprise P3015 Series, HP LaserJet Pro MFP M521 Series | CE255A : Electronics
Amazon.com: LD Products Compatible Replacements for HP 55X 55A CE255X CE255A Toner Cartridge for Laserjet P3015 P3015dn P3015x HP Laserjet Pro 500 MFP M521dn M521dw M521 M525 Toner Printer (HY Black, 2-Pack) :