Glade PlugIns Scented Oil Refill twin packs are on sale for $4.99 this week at Walgreens. Buy one and earn a $2.00 Register Reward at checkout. A Register Reward is like store credit for a future Walgreens shopping trip. Print a new $1.00 Glade coupon for a final price of $1.99! I always try to get each individual refill for $1.00 or less, so this is a great price.