It aways pays to befriend a librarian, I've managed to pick up quite a few handy books over the years during clean outs. I've gone one better now though. My wife decided last year she was sick and tired of being a chef so she packed it all in and decided to open a book shop
New, pre-read and classics. She loves to trawl garage sale and she always has people coming into the shop wanting to buy swap and sell. You should see my library now