Amazon.com: greencycle Compatible Toner Cartridge Replacement for Samsung SCX-4521D3 SCX4521 Use for SCX-4521 SCX-4521F SCX-4521FG SCX-4521FR SCX-4321 SCX-4321F Printer (Black, 1-Pack) : Office Products
LD Compatible Replacement for Samsung SCX-4521D3 Black Laser Toner Cartridge for use in Samsung SCX-4321, SCX-4521, SCX-4521F, SCX-4521FG, and SCX-4521FR s - Walmart.com
Amazon.com: NineLeaf 6PK Compatible Replacement for SCX4521 Black Laser Toner Cartridge for use in SCX-4321 SCX-4521 SCX-4521F SCX-4521FG SCX-4521FR Printers : Office Products
Compatible Black Toner Cartridge SCX-4521D3 for Samsung Printer SCX-4321/ SCX-4521F/SCX-4721F - Tianse
Samsung SCX-4521F Toner/Drum Cartridge, Black - $94.95 | SCX-4521D3