Libraries don't have all the new releases, and when they do have them you're dealing with a long waiting list to be able to check one out. Same issue applies to used book stores; they rarely have what you're looking for. If you're just looking for any book then you're good, but if you want something specific you pretty much have to buy new.
The ebook readers are moving toward the idea of being able to loan your ebooks to a friend, which I like. Aside from that, I think the best option is buying new and reselling on ebay or half.com when you're done reading, assuming the book is in demand.
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