On Onyx i62, M92, you haven't a "library". You use a classical filesystem with directories if you want. It's more useful because you can order your books as you want, by directories, filenames - the name of the file, not the name of the book. You can order them with the metadata (the name of the book for EPUB), but if you have many books it could be a quite long because all books must be analyzed for that before to be displayed.
Read this thread "Where to buy a Onyx M92" :
https://www.mobileread.com/forums/sho...d.php?t=172797, about the stores.
In this forum, the support is done by Booxtor :
http://ereader-store.eu. Booxtor provides the updates for the standard Onyx devices :
https://www.mobileread.com/forums/sho...d.php?t=164162.
If you live in Canada, the cost of shipping + local taxes is to consider.