I wanted to create a textbook that follows the video lectures I have posted online. This textbook was the result. I offer multiple versions to meet your exact needs. The Complete Textbook ($3.99, on Amazon) covers the entire course. If you need something less, you can opt for just chapter one for the essentials of strategic form games (The Basics, $0.99, on Amazon), just chapter two for an introduction to extensive form games (Extensive Form, $2.99, on Amazon), or just chapter three for advanced topics on strategic form games (Advanced Strategic Form Games, $2.99, on Amazon).
Which should you buy? It depends on your needs. If you have a passing interest in game theory, I recommend The Basics. However, if you are using this for a class, you will almost certainly need The Complete Textbook in the long run, so you might as well make the investment. It is only $3.99 anyway, and that is a cheap price for a better grade. (The $3.99 book contains everything, so there is no need to purchase any of the other books.) Only buy Extensive Form or Advanced Strategic Form Games if you have a very specific need. If you are still unsure which to buy, check the product descriptions on Amazon of the books and compare the topics covered to your class syllabus.
Regardless, you should buy one of them. Here's why: