Agreed. There are also several series of "problem books" out there, that are nothing but hundreds and hundreds of problems (and solutions) for a given subject. They tend to have titles like "The Humongous Book of Calculus Problems" or "The Humongous Book of Algebra Problems", or "1001 Solved Problems in Linear Algebra", etc.

I also buy cheap used copies of older editions of various text-books to supplement the video stuff. When you don't have to worry about using the latest version because it's required for a class, you can find some really cheap deals.