Using the coupon apps Zweet and Checkout 51, plus a printable coupon from Advil.ca, you can get Advil Cold & Sinus or Advil Nighttime for $.99 cents.
I always keep the Advil Cold & Sinus stocked as it's the only cold medication that my husband and I can use.
First on Checkout 51, you'll see a $3 rebate for Advil Nighttime. Print a $3 coupon from Advil.ca and submit your receipt, after you buy it at London Drugs for $6.99.
For the Cold & Sinus, also on sale at London Drugs for $6.99, print a $3 coupon from Advil.ca and submit your receipt to Zweet for $3.