Oops just realized that these are books of commentary about Clockwork Orange rather than the screenplay itself. Although careful search also turned up the screenplay (link not provided since it didn't appear to be an authorized copy).
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Clockwork Orange is ~$20 at eBooks.com, Diesel Books, and Books on Board
http://www.ebooks.com/ebooks/book_di...asp?IID=217193 ($20.00)
http://www.diesel-ebooks.com/cgi-bin...nge-eBook.html ($21.00)
https://www.booksonboard.com/index.p...162&v=synopsis ($20.00)