Diffuserworld.com offers a variety of coupons and promo codes. Customers can find these on various coupon and deals websites. Some of the offers include 5% off the entire purchase, 20% off with a promo code, and free shipping. There are also deals on specific products, such as a 52% off on Aroma-Spa™ Vaporizer which includes a 5ml Peppermint Oil. There are also seasonal discount codes that can provide up to 60% off. It's recommended to check these websites regularly as the offers and deals change frequently. Please note that these offers are subject to terms and conditions and may require a minimum purchase amount. Always verify the validity of the coupon or promo code before making a purchase.