I went to the library to return books, and ended up at the book sale, again. $1 books. I got to the end of the frequent buyer’s card, so I got $5 off.
I found books that were part of series that I had. And some that were part of series that my daughter had.
I got some books that are part 3 and I don’t have 1 or 2. I’ll find them eventually.
So far, only one unintentional duplication. The rest are added to the book stack.