Dental Hygienist. They make like $40/hour to clean people's teeth. It only requires an associates degree and you can get it from community college (aka cheap).
Dental hygiene is a pretty awful field for most people though - there's a lot of depression and heart problems from having to cause people pain (even if you logically know it's good for them). This is a great option for some people but if you consider yourself empathetic I'd urge some caution.