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The following products are compatible with the HP DeskJet 3840:

IJ Reman HP C8727AE (27) Black Cartridge
IJ-27B

£8.99 inc VAT
£7.49 exc VAT

Estimated Delivery: 1-2 days
 

IJ Reman HP C8728AE (28) Colour Cartridge
IJ-28C

£11.99 inc VAT
£9.99 exc VAT

Estimated Delivery: 1-2 days
 

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