I'm pretty sure you don't need "Adobe DRM'd ePub" i haven't had any trouble with just normal ePub files. Borders store is annoying as the search function is broken just search the authors name and nothing relavent will come up, but if you notice there a link that says "did you mean book written by ___" or something like that. Even then it will come up with physical books as well as ebook. At least there clearly mark whether they're ebooks or not.
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