This was a comment on the question, but should be an answer. You don't. If you can't afford it, you can check it out of the library. If you want Lisa Mantchev to be able to keep writing so you can read more of her stuff, you buy it so she gets paid for her work.
If you have a library card in your country, you can buy from there, and it can be a real blessing. Don't get tricked by a fake or fake looking product or the quality of the books on Amazon.