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
Lexmark - black - original - toner cartridge - LCCP, LRP - C540A1KG - Toner Cartridges - CDW.com