Calibre is not a store. It is primarily a very sophisticated cataloging system for ebooks. Some neat features also allow you to: convert from almost any ebook format to the format that works best on your device (provided you first remove the drm); automatically retrieve periodicals/news subscriptions; add your own tags and metadata and Calibre mates with most ebook devices to add/remove ebooks from your device.
Try it, you'll like it.
cheers
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