Amazon.com: New Era Toner - (160g) High Yield Toner Refill + Chip for use in Samsung 203L Black Toner Cartridge (MLT-D203L) for ProXpress M3370FD, ProXpress M3870FW, ProXpress M4070FR, SL-M3870FW - 5k :
Samsung ProXpress M3870FW Toner Cartridges
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) - Newegg.com