Eggs (unopened; only if not pasteurized/cleaned which you will not find in a typical US grocer for anyone other than OP).
You can usually tell by where the eggs are located in the grocery store. US eggs are 'cleaned' and kept in the fridge at the store (and at home), whereas a lot of other countries don't clean them and you just find them on a regular shelf instead of in the fridge.
It's interesting... It's mandated to wash eggs in the USA, whereas it's mandated to not wash eggs in Europe. Different standards.