frankly I don't understand why you consider lonely planet "too expensive"? It sounds like you're about to spend a few months and quite a bit of money on a tirp, and you can't spend $20 for a book?? Also, on their website, you can buy pdfs of specific chapters from their books, making it even cheaper (and easier to carry).
I don't know if you'll find a comprehensive free travel guide all tied up in a bow for you, but of course all the information you need is on the web--somewhere, such as on this site, lonely planet, etc. You should be able to get all the info that you need, although of course it will take more work. Your call if all that is worth $20 or not.
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