Newegg offers the Rosewill Brother-Compatible TN660 Black Toner Cartridge, model no. RTCG-TN660, for $24.99. This $8 mail-in rebate drops it to $16.99. With free shipping, that's $33 off list and the lowest total price we could find. It replaces Brother TN-660 and TN-630 cartridges. Rebate offer expires May 6.