I have built up a pretty nice library of somewhat valuable out-of-print books in my fields of interest by looking through photos in online auctions of books sol

I have built up a pretty nice library of somewhat valuable out-of-print books in my fields of interest by looking through photos in online auctions of books sold by the yard, or grouped by color. Have found many individual books that would cost $100 or more sold individually as part of unsorted lots going for $8-10. Yay book styling.