I have this problem every time I go to Finland! We did find a little shop in Helsinki that sells US and British food and condiments, which has made it easier, but it's REALLY expensive, like eye-popping, ridiculously expensive. So now I plan ahead, and ask him for anything I'm not sure they have, translate it into Finnish, and if he doesn't know, I bug him until he goes to the store and checks
If he's never heard of it, and doesn't see it, I bring it with me. Unfortunately, we have some interesting fruits and veggies here that I can't find when I go over, and those I can't bring with me, so he's outta luck until the next time he comes here.

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