Brother Black Toner Cartridge (TN-350) for $43.99

You'll want to have one of these on hand when that toner light starts flashing: just snap this black toner cartridge into place and you'll be up and running again. Compatible with Brother laser printer models HL-2040 and HL-2070N, the TN350 has an expected lifetime yield of 2,500 pages (based on 5% coverage).