No need to get as fancy as some of the replies below would have you think. Believe it or not, Kirkland brand olive oil (yes, from Costco in the 2-liter jugs) is widely considered, even by many professionals, to be among the best olive oils on the market that you can buy at a reasonable price. I personally use it and love it, and i'm originally from a region of the world where many families had many generations spent growing their own olives and making their own oil.