HP 646X High Yield Black Original LaserJet Toner Cartridge, ~17,000 pages, - Walmart.com
HP's Planet Partners Toner Recycling Program - HP History
Amazon.com: HP 305A Cyan, Magenta, Yellow Toner Cartridges (3-pack) | Works with HP LaserJet Pro 300 M351, LaserJet Pro 300 MFP M375, LaserJet Pro 400 M451, LaserJet Pro 400 MFP M475 Series | CF370AM : Electronics