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That might be hard to figure out. Probably best to just figure out the size of each book store. Examples:
Fictionwise:
DRM: 36,767
DRM-free: 20,108
Amazon:
DRM: 229,406
Webscription:
DRM-free: ~550
BookOnBoard:
(boy their site is hard to use)
DRM: (couldn't get their DRM search to work, but one of my browses turned up 303,000 books, includes audio)
DRM-free: 17,938
Double Dragon:
DRM-free: 449
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