Most of the books I actually ended up getting came from John K. King Books, in Detroit, still my favorite used bookstore in the world. I used to go there when I lived briefly in Ann Arbor. They have a web site now, but when you visit it (link above) the first thing you see is a giant sign reading
BESIDES OUR ONLINE RARE BOOK STOCK, JOHN K. KING USED & RARE BOOKS HAS 750,000 TITLES IN STOCK PRICED YEARS BEFORE THERE WAS AN INTERNET AND NOT AVAILABLE ONLINE !
THEY’RE NOT ONLINE, THEY’RE ON SHELVES
God knows I love the internet, but that notice is extremely gratifying to me. King Books is freaking enormous--it's a gigantic warehouse with floor after floor after row after row of shelf after shelf of books, any of which you can pick up and buy. This sounds kind of obvious, but I've become so used to getting whatever I want online that it has become hugely exotic to imagine an actual tangible warehouse full of old books you can walk around in.
What was I in search of, in those days? Evan S. Connell, Rick DeMarinis, Eudora Welty. I also managed to find, in one of my actual visits to the place, a rare copy of Death and the Good Life, the only novel--and a crime novel, at that--by poet Richard Hugo. (It's not even mentioned on his Wikipedia page.)
First paragraph of that novel: "I imagine the three men having a good time. I imagine them singing." Go find it, if you can. In fact, I know you can. It's the internet era, after all.