Canon Knowledge Base - Replace the Toner Cartridge with a new one (LBP6000)
Canon Support for imageCLASS LBP6000 | Canon U.S.A., Inc.
LD Remanufactured Replacement for Canon 3484B001AA Set of 2 Black Laser Toner Cartridges for use in Canon ImageClass LBP6000, LBP6030w, and MF3010 s - Walmart.com
Canon LBP 6000 toner refill, How to refill laser printer toner cartridge - YouTube