Book price comparison website?

[Greenlizard0]

There are a few dvd and cd websites out there that basically list the price of an item where it's sold through different online stores, thus allowing you an impartial comparison.

However does anybody know of a book equivelent please?

 

[Greenlizard0]

I found a really good one but doesn't list what is technically my two favorite bookshops online (and who are competitors as it happens) so it's still quite annoying....gar..boo..