MiroPure via Amazon offers its MiroPure Aromatherapy Essential Oil Diffuser Humidifier for $24.99. Coupon code "EBWUNK3N" cuts that price to $18.74. With free shipping for Prime members, that's tied with last month's mention at $31 off and the lowest price we could find. It features a 300ml tank, color-changing LED, four timer settings, and auto-shutoff.