We use map pins all over our shop. On our wall, on our boards, on our cork displays, on our neighborhood map. Until recently, there was an awesome U.S.-based brand called Moore Push-Pin Company that we purchased ours from, but they've since closed. These tacks from Japan are the best ones we've been able to find to replace them.
Velos is a stationery and office supplies manufacturer in Osaka, Japan, who specialize in pins, tacks and clips.