You’d probably enjoy Khan academy and coursera.
Also, MIT has thrown all of their courses online for free, so you can get a free, albeit non-accredited, MIT education.
There are also several groups now offering the classes on which all CLEP tests are based online. You take the online class to prep for the test, then pay $79 for the test. Way cheaper than college tuition. An enterprising student, whether home schooler or college kid home for the summer, could knock out a lot of college credits that way.
Thanks for that info!