Drugstore.com: 20% off for New Customers October 26, 2010 This post may contain a link to an affiliate. See my disclosure policy for more information. Drugstore.com is offering up 20% off for new customers! All you have to do is use coupon code WELCOME20 at checkout. **Don’t forget to go through ShopAtHome! You’ll earn 8% cash back on your Drugstore.com purchases.