Asian food items, especially condiments like garlic chili sauce. Argentines prefer bland foods. While the selection in barrio chio has gotten better in the last 20 years, its still pretty thin.
As mentioned above, specialty tools and electronics.
Strangely enough, while there is more quantity of cheap Chinese imports in Argentina these days, quality Chinese products are not available, and selection is very limited. One style of electronic switch, at every store, while on amazon usa there are 40 different ones. One brand of import item may be quite common, as opposed to dozens, probably because a few families are importing, and the ability to direct import is still quite restricted.
If you have particular tastes in health or beauty products, or organic foods, or outdoor equipment or dj equipment, bring it.
Most of our friends who visit buy jewelry here, and often watches- but vintage, where selection and price is great.
In general, the hardest things to find are mass market large corporation brand name consumer products at low prices. Nike or casio or vans or levis all exist, but at higher prices and smaller selections.
