Lexmark C540H2KG Toner - C54x Toner Black @ $45.99
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 C540N Cyan High Yield Toner Cartridge, Genuine (G0736)
Amazon.com: 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 : Office Products
Genuine Lexmark C540H1MG Return Program Toner Cartridge Magenta C540 C540N C543 C544 C544DN C544DTN – Ink Direct Corporation
Lexmark C540 Toner Cartridge Set | OfficeCrave.com
High Yield Yellow Toner Cartridge for Lexmark C540/C544/X543/X544 – The Printer Depot