Why doesn’t Seoul have Iron Dome?

Why Seoul doesn't have an Iron Dome. Everyone's been marveling at Israel's missile defense, but now in the middle of the crisis on the Korean Peninsula, one wonders why Seoul doesn't have a similar system. Baron wondered, too. From the E-Ring: "Nearly 11 million people live in South Korea's capital, roughly 35 miles from the Demilitarized Zone. North Korea is threatening to make it rain artillery and missiles on its sworn enemy. And Israel is desperate to find a buyer for the incredibly expensive missile defense system. South Korea sure could use Iron Dome right about now. But a series of blown multibillion-dollar deals with Israel over the past two years has left South Korea instead rushing to beef up the patchwork network of American and Korean missile defenses, including Patriot missile batteries on land and Aegis-equipped destroyers deployed at sea." http://e-ring.foreignpolicy.com/