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The following products are compatible with the OKI B 840:

Think Alternative 44661802RT Black Replacement Toner Cartridge (Replaces Oki 44661802)
Estimated Delivery: 1-2 days
 

OKI Black Toner Cartridge 20K pages - 44661802
OE-T-44661802

£435.18 inc VAT
£362.65 exc VAT

Estimated Delivery: 3-4 days
 

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