I'm a longtime customer of Dermstore and noticed on their website that if you are a new customer and/or visit the site for the first time you get better promo codes than longtime customers.
I kept ordering from them because they used to have free express (2-day) shipping and I could get products quickly without paying anything for shipping. Well, they quietly changed their shipping and now it's been several days since placing my last order and it's not even on its way yet. Will be looking for a new online site for skincare products.