In the last week, I have bought peanut butter, toothpaste and tomato sauce for the first time in a year and a half.
The toothpaste is easy to explain - I love Colgate and it's hard to get in Korea, mostly only sold in blackmarket shops that get it off the American army base. Now that I live a stone's throw from the base, that's not a big deal, but spending over an hour on the subway for toothpaste is ridiculous, so I've always just brought enough for a year. Plus, Jenn gave me a tube of nasty-tasting Korean stuff, which I felt obligated to use because I hate the idea of wasted resources.
As for the peanut butter, don't think I don't eat it all the time. It's just that my last jar was from Costco - even a peanut butter lover can't eat 4 pounds of peanut butter quickly. The tomato sauce is explained by the fact that I bought a three pack right around the same time that I started making my pasta with tomatoes but not tomato sauce.
Still, it's an odd way to shop. And I won't need to go shopping for body lotion for at least another year.