We use map pins all over our shop. On our walls, on our boards, on our cork displays, and, of course, 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.