Amazon.com: Compatible Brand Toner Replaces Lexmark 64035HA High Yield Toner For Lexmark T640, 642, 644 Printers - This Is The High Yield 21,000 Page Cartridge : Office Products
Lexmark T642 Toner Cartridge - Inkjets.com
Lexmark T640/T642/T644 Black Toner Cartridge (64035HA)
Lexmark T640 Black 21,000 Page High Yield Replacement LaserJet Toner Cartridge | Monroe Systems