In a true Scottish way of putting it, I "made an erse" of my original post, so here goes again!
Was browsing Red House and noticed they have a deal for the seven Harry Potter books (Philosopher's Stone, Chamber Of Secrets, Prisoner Of Azkaban, Goblet Of Fire, Order Of The Phoenix, Half-Blood Prince, Deathly Hallows).
Buy Deathly Hallows (for a higher-than-average £12.99) and you get the first six books in hardback for £19.99 (instead of £29.99) - a total of £32.98, or £4.71 per book.
Seems an excellent deal to have them all in hardback, brand new, particularly as they'll all get more popular now that the new one's out. Free Postage and Packaging on all Red House orders as well.