Beauty Boutique by Shoppers Drug Mart is one of my go-to places for cosmetics and such. Right now you will get $10 towards your next purchase when you spend $50 or more.
Once you've made your purchase, you can keep your eyes peeled for your $10 credit. It will arrive by June 21st and you will have to use it by July 9th. Limited to one promo code per customer per transaction.
I also noticed that you will receive a free deluxe sample from Lise Watier with every online order. It is the new Perfexion Creme Jour Correctrice Anti-Age (3 ml).
You will want to scout out the sale section where you can find items from $3.29.
The Beauty Boutique by Shoppers Drug Mart also throws in free shipping on orders over $50.