Genuine OEM Lexmark 2381 Plus Toners
The Lexmark 2381 Plus takes a black re-inking ribbon, not a laser toner cartridge. Lexmark specifies ribbon life in printed characters under draft-mode conditions. That means pages with dense text and pages with just a few lines do not use the same share of the ribbon's rated life.
Toner Buzz carries the genuine Lexmark 3070166 standard black ribbon for this model. Match 3070166 for a ribbon order, keeping the ribbon product type in mind rather than treating it as toner.