I was at High Street Market in Itaewon yesterday, and they had Reese's Peanut Butter Cups, sold individually, at the register. They weren't cheap, but I know that many Americans miss them. I was more excited that they had tomato soup cans, because none of the other foreigner shops had any in stock. I bought the last 4 cans.
Please keep an eye out for more, and post here, if you happen to see tomato soup at any of the foreigner shops in Itaewon, because I like to stock up. We didn't see any for 4 or 5 months last year. I could make my own, but canned tomato soup is probably the only processed food that I prefer to homemade.