At Piping Rock, buy the Piping Rock Eucalyptus 100% Pure Essential Oil 0.5-oz. Bottle for $4.79 and get a second bottle for free. (The second bottle is added to your order automatically.) With $1.95 for shipping, that's tied with our August mention and a buck under the lowest total price we could find for this quantity of a similar oil elsewhere. It purports to soothe the respiratory system and ease joint and muscle discomfort. Deal ends March 18.