Toner for Laser Printer: FS-4100DN, 4100DN / KL3, 4200DN, 4300DN, 4300DN / KL3, FS-4300DN
From Amazon
Kyocera TK-3110K Toner Black, Original Premium Cartdrige 1T02MT0NLV. Compatible ECOSYS FS-4100DN
Conrad Electronic
Kyocera Toner TK-3110 Original Black 15500 Sides 1T02MT0NLV