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 C540 / 543 / X543 / C544 / X544 Black HY Prebate Toner Cartridge - 2,500 pages - Australian
Yellow Toner Cartridge for Lexmark C540/C544/X543/X544 - 2000 page yield, Replacement for OEM cartridge