I think I finally got rid of all my college text books. They were expensive, but my dinky degree was funded by government (veterans benefits) and corporate (employment benefits). Of course, they might be stuck in a box out in the shop or a closet somewhere.
Amazingly, after almost 30 years, my new job has required me to apply some of the stuff I learned in real life. So I actually had to crack open a few of these books, for the first time in decades. And some were useful.