Amazon.com: AZ Supplies Compatible Toner Cartridge Replacement for Lexmark 56F1X00 56F0XA0 EXTRA HIGH YIELD BLACK COMPATIBLE MS421dn-421dw-521dn-621dn MX421ade-521de-522adhe-622adhe Extra High Yield Black 2 Packs : Office Products
Lexmark 56F1X00, 56F0XA0 Extra Hi-Yld Compatible Toner - Black ...20000 pages yield
SuppliesMAX Compatible Replacement for Lexmark MS-421/MS-521/MS-621/MS-622/MX-421/MX-521/MX-522/MX-622 Series Extra High Yield Toner Cartridge (20000 Page Yield) (56F0XA0) - Newegg.com