Amazon.com: Lexmark C540, C543, C544, C546, X543, X544, X546 Series High Yield Magenta Return Program Toner Cartridge (2,000 Yield), Part Number C540H1MG : Office Products
Compatible Lexmark C540 toner set | Gear Geek
Lexmark C540 High Yield Magenta Toner Cartridge - C540H1MG
Black Toner Cartridge for Lexmark C540 C540n C543 C543dn C544 C544dn C544dw