Welby Cool Mist Ultrasonic Aroma Diffusers are on sale for $9.99 this week at Aldi. Walmart sells a comparable version for $17.00, so take advantage of this great price now! Plus, check out the top 19 ways a newbie can use essential oils.

Final Price: $9.99

Price Comparison: $17.00 at Walmart (Better Homes & Gardens 100 mL Cool Mist Ultrasonic Aroma Diffuser)