Best Self-Study Books?

I’m looking for the best self-study books for AP Environmental Econ, Psychology, Computer Science A, Macroeconomics, and Microeconomics. I’ve seen Barron’s and I’ve also accessed the recommended texts for AP teachers via the AP website. However, they are all pretty expensive and I’m not sure which ones are the most helpful. If you have any knowledge of good books (or websites) for each topic, please enlighten me. Thanks. I’ll post the ones I end up getting as well as my scores later on.

Barron’s for AP Psychology