It's a bit difficult to compare ebook prices to Australian paperback and hardback prices in the same way as you can (for example) do it in the US. This is one area Australians are somewhat lucky for many ebook prices.
For example, just looked up Telegraph Avenue by Michael Chabon. The paperback on the Dymocks site is $29.99. Yep - that's paperback. The price showing for the ebook is $9.99 at Google Play etc..
So it's considerably better to get an ebook as an Australian than it is to get a hardback/paperback in some cases.
However, interestingly, the ebook at Dymocks (powered by Google eBooks) is showing $14.99 for the ebook.
So if you purchase through Google ebooks using the Dymocks storefront you pay $14.99, but you only pay $9.99 if you purchase from Google Play directly.