New Fuzion - Brother TN850 Laser Toner Cartridge - High Yield Premium Compatibles. No need to be apprehensive when choosing an aftermarket toner cartridge because Fuzion toners are head and shoulders above the rest. After 15 years in business this is our number one choice and also the brand in most of our printers. Buy for less than the big box stores form the CartridgeStore, family run and operated since 2003.