It doesn't matter what kind of game you are interested in learning about. It could be baseball, baseball card collecting, football, card games, and it goes on and on and on and on. A quick trip to amazon.com and you realize that most of these books cost $20 or more. You could buy one and find out that it was completely not the one you wanted.
You can visit your local bookstore, but what are the odds they have a decent selection of books about your given subject. One place you can always count on is the local library. Even if they don't have the book you want, then you can have them order it from another library. You have an average of two weeks to read it and by then you can decide if its worth actually buying it or not.
May libraries are keeping up with the times and have different types of e-books available for rent. Don't let a narrow mind keep you from getting the game book you really want and need. A trip to the local library can make the decision to buy much easier and it won't cost you a cent.