Korner's Kant is out of print

I started once again trying to read S. Koerner's book on Kant, published by Penguin in 1970. My old copy is turning to dust. I think the first 20 pages or so are probably held together by the ink from all the underlining I did 25 years ago. Anyway, I just checked on Amazon, and apparently it's out of print. I can't say I'm surprised. I recently bought a used copy of Robert Redfield's "The Primitive World and Its Transformations" - also out of print, and another book from my student days.