When I want to buy a paper book, I search bookfinder. Is there a similar tool to see if anyone sells an ebook without DRM of a particular title?
When I do not know the store, I have no way to know whether they just will mail me an ePub, or want me to log in to some baulky, script-heavy cloud service to download the code to let some non-free software download the actual book. I find that the second kind of shop is not worth the trouble.