Is there any place in Seoul where I can buy the extreme cold weather boots that go by the nickname "mickey mouse boot"?
In case you haven't heard of these and their nickname makes them sound something like Disney or Hello Kitty, here's Wikipedia's description:
Bunny boots is the widely used nickname for the Extreme Cold Vapor Barrier Boots (Type II) used by the United States armed forces. The liner-less bulbous boots retain warmth by sandwiching up to one inch of wool and felt insulation between two layers of rubber and are typically worn with one heavy wool sock. These boots were originally developed at the Navy Clothing and Textile Research Center in Natick, Massachusetts, US, for use during the Korean War.
Originally designed for the military, such boots have become staple cold weather gear both in civilian work and recreational environments. Bunny boots are very popular in Alaska.