Original Samsung SCX-4521D3 toner cartridge - black - 123 Refills
CS-S4521) BK toner laserjet printer laser cartridge for samsung scx 4521d3 4321 4521 4321f 4521f (3k pages) - AliExpress
Original Samsung SCX-4521D3 Black Toner - LD Products
Compatible Replacements for Samsung SCX-4521D3 Set of 2 Black Laser Toner Cartridges for use in Samsung SCX-4321, SCX-4521, SCX-4521F, SCX-4521FG, and SCX-4521FR s - Walmart.com