I don't know if it has DRM in it but if not then Calibre will be your best friend. Basically it's a probram that changes the file type so it can be read on any kind of E reader, I'm currently using it to make an Epub version of the Mistborn annotations for my own personal use. so if no DRM then just go with the best deal and put it through Calibre, however striping the DRM to do so, while I consider it to be ethical, it is not exactly legal, so I can't help you there.