It will almost certainly be far cheaper to just buy another copy to carry around.
The easiest way to scan the book (copyright allowing, of course) is to cut it up so that you can a) keep the pages flat and b) feed it through a bulk paper handler (as you would find on any decent photocopier).
Otherwise you will spend many mind-numbingly boring hours manually scanning page after page, and then probably have to OCR to text to overcome the (inevitable) curl, then proof-read / cross-check the text, then format it then save to pdf.
SD