Samsung SL-M3870FW Laser Toner and Printer Supplies - InkCartridges
Amazon.com: HI-Vision Compatible MLT-D203L / XAA High Yield Laser Toner Cartridge for Samsung ProXpress M3320ND, M3370FD, SL-M3820DW, M3870FW, M4020ND, M4070FR Printer (203L, Black 2 Pack): Office Products
Shop Staples for ProXpress M3870 FW Toner Cartridges
Amazon.com: (1-Pack) Extra High Yield Compatible MLT-D203L D203L Toner Cartridge 203L Used for Samsung ProXpress M3370FD M3870FW M4070FR M3320ND M3820DW M4020ND Printer, Sold by EasyPrint: Office Products