Bundle sites for eBooks - are there any?

Greetings all

So with PC Gaming there are sites that do bundles of games sometimes on a theme or a pick 5 for $5 etc

both of these PC Gaming sites do actually do book bundles
Humble Bundle
Fanatical
as examples
but as you can see they are almost always either comic/Graphic novel, self help or Technical books, almost never actual novels, books.

I am just wondering if there are actually sites that do bundles of ebooks

Thanks