Walmart offers the Better Homes & Gardens Cool Mist Ultrasonic Essential Oil Diffuser 7-Piece Set in Off White for $12. (Other colors are also available for a few bucks more.) Choose in-store pickup to dodge the $5.99 shipping fee. That's $28 off and tied with our mention from last week for the lowest price we could. The 50mL diffuser comes with six 5mL bottles of essential oil.
There are many ways to get cheap and even free services and goods after reaching a certain age.