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Harry Potter Blu-ray set (1-6) £17.99 at HMV. Comes up on the page at £24.99 but goes in the basket at £17.99.
It's a new sale and the price on the main product page hasn't changed yet. Pretty sure it will fly once it does though.
Edit: Looks like they've now changed it to £17.99 on the page.
CEX still giving £21 exchange on it too.