I have discovered the A4 casebound version of the Absolute Greatest package available for pre-order for £12.99. (as a comparison, Play.com have it for £29.99).
Please note that if you search the CDWOW website for the product it isn't yet listed anywhere and doesn't appear, but I found the link to it by searching Google for "Queen A4 Casebound" (just so that you know it is a genuine link).
Hope this may be of interest in saving a few £s to those who are buying!
Cheers mate. I've ordered.
Just a word of warning though.
I've pre-ordered stuff with CDwow before (using my paypal account so that they take the money straight away, which means it's been paid for!), but they're buggers for not honouring prices if they realise they've made a pricing error (and under UK law, if it's paid for then a contract has been made - but CDwow aren't a UK company).
So. Just be aware folks and don't be surprised and upset if you get a cancellation email from them close to despatch time.
I've ordered and pre-paid with my Paypal account too. Worst case scenario, if they do what you have described and hike the price up and don't honour the original, I'll cancel the order, get my money back from them and shop around again at the time.
I know some stores do have 'secret' pre orders where they test the market to see what demand is like at a certain pricing point, so that they can guage demand vs competitive pricing for their profit margins - I'm hoping that this is a genuine case of this in this instance!