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Hi Jon, you can find the current price of the black and colour ink at the top of the following page:
https://www.tonergiant.co.uk/model/HP-DeskJet-2720e-ink-cartridges/
We don't take the empties back I'm afraid but we have guidance on what to do with them here:
https://www.tonergiant.co.uk/recycling/
If you need any more help, let me know.