Lexmark MS312dn Black High Yield Toner Cartridge, Genuine (G2427)
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) - Newegg.com