Trader Joe's now has a house brand of 100% Greek Kalamata olive oil, which they buy in bulk and bottle, and is very good for the price.

Does it taste at all like olives, or is it the same bland test-tube oil?

The traditional place to buy it in the U.S. has been in 5-liter tins at Mediterranean grocery stores catering to immigrants (depending on the region, these might be "Greek", "Lebanese", "Turkish", or "Arab" supermarkets). These are a great deal, especially if you cook with it, but off the radar of most regular shoppers.

This is an excellent tip, thank you.