title_body: Can I get just the EPUB file from the Kobo store?
upvoted_answer: Yes. Once you've purchased the book, you can go to "My Books" and find the one you want to download. Below the thumbnail of the book cover there is a "..." menu which looks like this when expanded:
  
  
  
  Click "Download" and you'll be presented with a dialog:
  
  
  
  Now you can load the downloaded epub on any reader you like.