Lexmark MS421, MS521, MS621, MS622, MX421, MX521, MX622 Extra High Yie – Pendl Companies
High Yield Toner Cartridge for Lexmark MS321/MS421/MS521/MS621/MS622/MX321/MX421/MX521/MX522/MX622 – The Printer Depot
Lexmark 56F1X00 56F0XA0 Toner Cartridge Black MS421 MS421dn MS421dw MS521 MS521dn MS621 MS621dn MS622de - Sun Data Supply
for Lexmark MS521 MX421 MS421 MX321| Alibaba.com
Lexmark MS421: How to Replace Your Toner Cartridge – PrintSaveRepeat.com
SuppliesMAX Compatible Replacement for Lexmark MS-421/MS-521/MS-621/MS-622/MX-421/MX-521/MX-522/MX-622 Series Drum/Toner Value Combo Pack (1-Drum/3-Toners) (56F0Z00_1PK/56F2X00_3PKVB) - Newegg.com