Can I suggest that as many people as possible email Waterstone's and tell them that reduced prices (prices that make sense compared to soft-back and in many cases hardback) will in the long term help their business?
If they choose to be blind and ignore the ludicrous prices they are presently charging, then ebook readers will vote with their fingers and buy elsewhere. The joys and opportunities of the online world!
If in the mood for emailing, and if interested in audio as well as in reading, why not get on to
www.passionato.com and tell them that charging more for FLAC downloads than they do for mp3 downloads in very nasty.