Ive been loving people and libraries going digital. I snagged several physical books that were out of print in the last year at prices I never imagined a couple

Ive been loving people and libraries going digital. I snagged several physical books that were out of print in the last year at prices I never imagined a couple of years back. examples - etudes for programmers, introduction to functional programming etc for < 20$'s. On Lisp for < 30 bucks still eludes me though.