kaan, finniusfrog - that's a valid point, and others have raised it too. We are guilty of being too US-centric right now, and we will try to fix that. Thank you for your feedback!
JSWolf - that's the same bug igorsk found, though it's really a 'feature'
We always display the lowest price for the book on the result pages, which is why you see 'Free' for 3 sites. And we use the rebate-price from Fictionwise for all their ebooks, which is why 206 Bones shows up as free for them on the actual ebook page. We will be changing that in a couple of days to always display the regular price from Fictionwise, and will figure out how to display the rebate price additionally if a rebate is available.
ahi - thanks for pointing out our feedback link!
zerospinboson, we are aware of PD books crowding subject searches because of their prices - we will be fixing that so it's easier to find non-PD books for any kind of search.
Crowl - I didn't know that about Waterstones - thanks for the info and the other links. Bol.com is on our TODO list already. We will check all of them out.