I was able to complete linear algebra, introductory physics, and vector calculus for something like $200 in voluntary book costs (tuition was waved). My instructors were knowledgeable and professional. I got more out of the physics class in particular than I did out of the University of Minnesota version, which were run by bored TA's and researchers who frankly had better things to do than lecture.
That saved me a full semester of university tuition. I had already completed the breadth electives in a previous pass through the academic world, but if I hadn't I could have shaved off another year or so, for a savings upwards of $22,000.
I believe we should continue to expand and invest in community colleges very aggressively, and keep them very cheap, and very easy to get into.