I put $25/ week into a college savings account for my 4 year old. I do weekly for dollar cost averaging, rather than trying to time the market. I started it with a few $k and it’s up to about $5k right now. It’s tax deductible and is invested with a target date fund. Even if the investment only keeps up with inflation, that’s $25k or so in today’s money. Probably enough for at least a semester or two.