Amazon.com: New Genuine HP C4127X / HP 27X/ Black Hi-Yield Laser Toner, HP LJ4000/ HP LJ 4050 Series/ EP-52X : Office Products
HP 27X (C4127X) Black (2 Pack), High Yield Toner Cartridge Replacement for HP LaserJet 4000, HP LaserJet 4050 by Printel | Price: $54.30 | Cartridge Products | Partsmart
HP LaserJet 4050 Black High Yield Toner Cartridge, Genuine (G8188)
Amazon.com: Genuine Xerox High Capacity Black Toner Cartridge for the HP LaserJet 4000, 4050 series, XEROX 6R926 : Office Products
MSE Brand MSE022127162 HP 27X Toner C4127X Cartridge LaserJet 4000 4000n 4000se 4000t 4000tn 4050 4050n 4050se 4050t 4050tn - Sun Data Supply