To purchase or seek to buy something; to go and obtain an item (somewhat formal/written).
新刊書を書店で買い求めた。
I bought the new book at the bookstore.
彼女は市場で珍しい茶葉を買い求めていた。
She was buying rare tea leaves at the market.
観光客が土産を買い求める姿が多く見られた。
Many tourists could be seen buying souvenirs.