I noticed on Sunday, when reading the Book Reviews, in the Culture supplement of the Sunday Times, that they have started listing the e-Book price, when available.
This does rather expose the common practice of pricing the e-book higher than the paper version, whether hardback or paperback .......
I don't have the paper with me for an example, but in some cases there was an RRP paperback of £7.99 or so (which will probably end up getting discounted) vs an ebook version of £13.99, which may well be price fixed.