Assuming $5.99 per paperback that would be about 83 books.   I have already found around 250 free ebooks (that I would actually like to own and read) from various sources so that would cost me just under $1500 to own all of those in paper form.  Sounds like a bargain to me, even for the one with 3G and 64Gig of memory.  A whole lot easier to carry also.
-Eric 
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You are never beaten until you admit it. - - General George S. Patton