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
MSE Remanufactured High Yield Black Toner Cartridge for Lexmark C540/C544/X543/X544 - Walmart.com
Lexmark C540 Toner Cartridge Set | OfficeCrave.com