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 Toner Cartridge Set - Black, Cyan, Magenta, Yellow
TCT Premium Compatible Toner Cartridge Replacement for Lexmark C540 C540H2KG C540H2CG C540H2MG C540H2YG works with Lexmark C540N C546DTN X543DN X548DTE Printers (BK, C, M, Y) - 4 Pack - Walmart.com
Remanufactured Toner Cartridge LXC540K Replacement for Lexmark C540H2KG Used for Lexmark C540 C543 C544 C546 X543 X544 X546 X548 Series Black 2,500