Be Green Ink Compatible Replacement Black Toner Cartridge for Lexmark MS310dn MS312dn MS315dn MS410dn MS415dn MS510dn MS610dn 50F1H00 Black Toner (2 Pack 5,000 High Yield) Ink Cartridges (Aftermarket) - Newegg.com
Extra High Yield Toner Cartridge for Lexmark MS410/MS415/MS510/MS610/MX410/MX510/MX610 – The Printer Depot
Lexmark 50F1H00 High Yield Return Program Black Toner Cartridge - Office Depot