I think I found a way to audit college courses without paying for them. Find someone that is taking the courses and get paid doing their homework (for cheap/free). Make sure they take good notes and provide access to all materials. Do their homework of course. If taken to the extreme you could have a CS/CE/Math background while possibly making money on the deal. Any time you want to take a course you advert that you will do the homework. You could even wrangle the victim to record the lectures so you can reference as needed.
At the end you won't have a degree, but will be able to do everything the degree demands.
Obviously there are issues with this, one being a moral issue.