I have an unused (still in the box, sealed plastic bag) toner cartridge, Samsung MLT-D203L, Black, High Yield. Fits:
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SL-M3320ND, 3310, M3370FD, M3820DW, M3870FW, M4020ND, M4070FR, M4070FX printers. This is not a Samsung product, but rather a clone. We used these clones in our printer/fax machine for many years and had this one on hand before our printer finally died of old age.