A secondhand or antiquarian bookshop that sells used books, out-of-print works, and specialized volumes.
週末はよく街の古書店を回って珍しい本を探す。
On weekends I often visit secondhand bookshops in town to look for rare books.
その古書店で子供のころに読んだ絵本を見つけた。
I found the picture book I read as a child at that secondhand bookshop.
専門書は新刊よりも古書店で探した方が安く手に入ることがある。
Specialized books can sometimes be obtained more cheaply from secondhand bookshops than as new copies.