While hardware support might be harder to get, your e-book buying options are actually pretty wide.
You can buy from any store that offers ADE-DRM ePub or PDF (usually called "Adobe Secure", or there will be something in the store's FAQ about needing Adobe Digital Editions installed), and of course any DRM-free shop.
The majors are the Sony Reader Store, Kobo Books which actually is the backend for Borders (owned by Chapters in Canada, so it's not going down if Borders does; they also have discount coupons which let you save off selected books by non-Agency publishers).
There are also smaller stores like Books on Board and eBookMall and many others which carry compatible formats.
Hope this helps and welcome to MobileRead!
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