If you haven't tried neem oil in your garden, we'll make you an offer you can't refuse. Experiment with a two-ounce bottle that makes up to six gallons of spray for just $2.99 or spring for eight ounces for just $9.99. Only processed neem oil is EPA-approved as a pesticide, but this 100% natural product is what has been used in tropical countries around the world for thousands of years.