Out of all the fabulous stores and shops in Chelsea Market, I love browsing at Buon Italia for imported Italian food. It's the best source for real Italian goods in the city (though Eataly is now a favorite too), with pasta, beans, tea, spices, cheese, fish, etc. etc.
The olive oil table itself has at least 50 different Italian olive oils to look at. Usually, I'm scratching my head and wondering if the $50 small bottle would taste 10x better than my normal olive oil (the answer: not really).