This Ultrasonic Aromatherapy Diffuser that was $59.99 and dropped to $39.99, drops again to $24.99 using our exclusive code BRADSDIFFUSER at the Sharper Image. As a bonus, you'll also receive a free Essential Oil that would normally cost $14.99. Shipping will add $9.95, but with the oil included, this is still the lowest price we could find for this diffuser by $15. It can run for three hours in continuous mode, or over six hours in intermittent mode and features a silent operation mode, LED indicator lights, and automatic shutoff. It's recommended for rooms up to 215 sq. ft. and sales tax is charged in most states.