Radha Beauty via Amazon offers Prime members the Radha Beauty Essential Oils Aromatherapy 6-Piece Set for $12.95 with free shipping. (Non-members can spend $49 to bag free shipping; otherwise, it adds $5.37.) That's $67 off and the lowest total price we could find. It includes 0.33-oz. bottles of pure peppermint, lavender, orange, eucalyptus, lemongrass, and tea tree oils.