Okidata 42103001 Black Toner - Oki 42103001 Toner @ $7.99
Print-Klex Compatible Toner Cartridge Set for OKI B4350 NPS B4350NPS B4350PS B4350 N PS B4500 B4500N B4550 B4550N 421–02802 TYPE N TYPE 9 9–Office Toner Cartridge Pro Series: Amazon.co.uk: Computers & Accessories