Amazon.com: HP 89A Black Toner Cartridge | Works with HP LaserJet Enterprise M507 Series, HP LaserJet Enterprise MFP M528 Series | CF289A : Office Products
What is more cost effective- ink or toner? - Brock Office Automation
HP 48A Black Toner | Compatible | Lower Price - LD Products
Amazon.com: HP 410A Black Toner Cartridge | Works with HP Color LaserJet Pro M452 Series, HP Color LaserJet Pro MFP M377, M477 Series | CF410A : Office Products