Good luck with the rocks, lol. FWIW, I don't think involving your son in the pursuit of funding is a bad idea either. Work/study or even a part-time job doesn't have to be off the table. My personal opinion, based on students I've known over the years, is that the ones who have a personal stake in the cost work harder at it. The students I've known who have 100% financing from their parents (like my ex) tend to take it for granted.
Just my two cents (which won't pay for a college education!),
L