Brother HL 3140CW, HL3150CDW, HL-3170CDW toner refill: do it yourself! - YouTube
Brother HL-3170CDW Toner Cartridge Set - Black, Cyan, Magenta, Yellow
E-Z Ink (TM) Compatible Toner Cartridge Replacement for Brother TN221 TN225 to Use with MFC-9130CW HL-3170CDW HL-3140CW HL-3180CDW MFC-9330CDW (2 Black, 1 Cyan, 1 Magenta, 1 Yellow, 5 Pack) - Newegg.com
Amazon.com: INK E-SALE 5PK Compatible Toner Cartridge Replacement for Brother TN221 TN225 TN-221 TN-225 BK C M Y Toner Set for Brother HL-3170CDW HL-3140CW HL-3180CDW MFC-9130CW MFC-9330 CDW MFC-9340CDW Printer : Office