K.Z.
I copied this from the Files Section of Yongsan Playgroups Yahoo Group. You should join if you aren't already a member.
Sand for Sandbox
Coming from Post down Itaewon turn right at the Itaewon Hotel and follow the road down the hill underneath the overpass. Keep on going straight passing the Thai Embassy (right) and the Sun-Chon-Hyang Hospital (left). After the hospital turn right at the second stop light (between Scarlet Restaurant and Dunkin Donuts). Go straight passing Buy-the-Way (right). Shortly after that you'll see a Car Center on the right hand side and next to that is a pile of sand on the sidewalk. On the left side is a Korean restaurant and a little further would come a police station. The office of the "sand shop" is set back to the left of the little drive way next to the sand. They bag the sand for you. One bag is W1,000.