UK computer book buyers should be more wise. Before blindly buying from Amazon assuming that on previous experience they were way cheaper than Waterstones for example, take a moment to do a comparison.
Recently I almost bought an iPhone development book from Amazon but found it £5 cheaper with free delivery from stock at http://www.compman.co.uk/ . The same book from Amazon would not have been despatched for at least 2 weeks.
So before you loyally line Amazons pockets, check to see if you could help smaller retailer and your own pocket too!