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Hi Mr Moore, I have added the page for the HP DeskJet 2710e so you can find the cartridges that you need:
https://www.tonergiant.co.uk/model/HP-DeskJet-2720e-ink-cartridges/
You can also find the black HP 305 ink cartridge with its current price here:
https://www.tonergiant.co.uk/product/HP-305-Black-Ink-Cartridge-3YM61AE-100000/
If you need any more help, please let me know.