Just a plug for this place. A friend of mine was picking up presents here yesterday and I tasted few vinegars (like white peach and Sicilian lemon, oh my god!) and their fancy
avocado oil.
They have every oil I could probably name off the top of my head: olive oils, walnut, Japanese roasted sesame, etc. and a ton of balsamic varieties - and everything is available in bulk (you may have to use their own bottles) and for tasting in tiny cups.
http://www.oilgoodness.com/