Zinetic can offer you huge savings on OKI B840dn toner cartridges. All of the toner cartridges, drum units and refill kits below are guaranteed to work in your OKI B840dn printer. We offer remanufactured and original OKI B840dn toner cartridges, toner refill kits and stick on reset chips so you can now decide what to use in your OKI B840dn printer. If you wish to make the biggest savings look at refilling your OKI B840dn toner cartridges and using our reset chips to extend the life or your consumables.