The one I use is Luzme
It queries several stores including Kobo, Amazon, B&N and in several countries.
It then for each book shows the price that it last saw for each source and country.
It is searchable by book name and author and series, although the series data is not complete as it comes from the stores.
You can set up a wishlist of books and emails can be sent when they change price.
This site does provide DRM status if the store makes that data available.
The format is not shown however Amazon sites provide Kindle format and others
at least ePub - I would be interested in any exceptions
ebooks.stackexchange.com/users/107/mmmmmm
Calibre is a downloadable (free, donations accepted) application that will allow you to search over multiple stores, for content.
Using the get books function, to provide information like comparative pricing between retailers and DRM status of the work at different retailers.
ebooks.stackexchange.com/users/109/James Jenkins
Yes there are.
The one I remember is Inkmesh .
You can filter by price, type (ebook, magazine, audiobook, etc.) device and language.
Its database has large gaps though.
This site does not provide DRM status.
ebooks.stackexchange.com/users/118/Tim
There is a decent search engine called Leatherbound ebook search engine .
Like Inkmesh and Luzme it allows you to search for a book across multiple stores and price compare.
Here is a sample search result (for an entertaining book I might add).
In addition, you can search for printed books, free ebooks, ebook under $5 and some advanced search options.
This site does not provide DRM status.
ebooks.stackexchange.com/users/142/Jason Down
Amazon only enhanced search engines (I'll group these together since they don't quite fit the question, but are still worth a mention).
Jungle-Search is an interesting search engine.
It's not limited to ebooks and is Amazon only (though you can choose from various Amazon stores, such as CAN/US/UK/GER/FRA).
The purpose of this search engine is to allow you to more easily search by discount rates and price ranges.
Here is the how-to section (for US since most of our users are US; you can easily switch to another country at the top).
eReaderIQ allows you to search amazon, track books and add them to a watch list (being notified of price drops for books, authors etc.).
It also has a history of pricing for ebooks.
This is available for US/CAN/UK Amazon sites.
ebooks.stackexchange.com/users/142/Jason Down
Are there any websites that work like ebook search engines, where you can perform a search over multiple stores and have the results sortable and/or filterable for file format, price, presence of DRM, and so on?
Are there any ebook search engines?
ebooks.stackexchange.com
<drm><search-engine><website>
ebooks.stackexchange.com/questions/891
ebooks.stackexchange.com/users/136/Sekhemty
Try Luzme, Calibre, Inkmesh or Leatherbound for search engines and price compare. Yes, there are a number of ebook search engines available, such as Luzme, Inkmesh and Leatherbound.
Some ebook search engines available include Inkmesh, Luzme and Leatherbound. Yes, ebook search engines do exist.