This week at Walgreens, Glade PlugIns Scented Oil warmers are on sale for $1.00 each, when you buy three or more. Print a few coupons to score three for free!

Use three $1.00/1Glade Oil; Plugins Scented Oil Warmer or Starter Kit, Manufacturer Coupon (target.com)

Final Price: Free, when you buy 3