Comes to mind:
Australia
- sponges (somehow better than Swiss ones)
France
- 'Cochon' brand wart remover, more effective than Dr.Scholl's
Greece:
- olive oil
Japan:
- 'Unacool' mosquito bite treatment (great applicator, instant relief, no residue, the best this perpetual mosquito target has found on 5 continents)
- office supplies: lots of nifty goodies, such as mechanical pencils, mini-brooms, etc.
- yokan
- space-saving computer accessories
- lightweight and strong folding umbrellas
Korea
- mosquito coils: far more effective than the less noxious Swiss equivalent
- dried laver: better price/quality than in Japan
Philippines:
- cotton T-shirts, always high quality heavy gauge material
US:
- Oral-B waxed dental floss; due to late removal of my wisdom teeth, this works best for me
- Theraflu
- aerospace-certified titanium bicycle parts (European makers tend to use Russian CP titanium)
- Quickgrid conductive pen
- jeans
- burrito mix