About 10 years ago I heard about some self-employed people that would take 6 college credits at a time, with the extra perk of the low cost student health insurance. Not sure if that strategy still makes sense with ACA options.
Decided to check (CU sample) - Fall semester $2311, Spring (incl Summer) - $2311. Not cheap, but cheaper than many options. Anthem Gold Student Health Insurance Plan (SHIP) | Health & Wellness Services | University of Colorado Boulder