Amazon offers the Glade Air Freshener Plugins Scented Oil Warmer 2-Pack for $1.55 with free shipping via the steps below. That's a buck under what you'd pay at a local store. Fragrances are sold separately. To get the deal:
  1. View the Glade Air Freshener Plugins Scented Oil Warmer 2-Pack for $2.27
  2. clip the 20% off coupon
  3. check out via Subscribe & Save for a final price of $1.55 with free shipping
Note: Be sure to cancel Subscribe & Save after receiving the item to avoid being billed for future shipments.