GLOSSYBOX Summer Sale: Save 30% on Any Subscription! Posted by Brandy on June 24, 2016. Subscription Box Coupons & Deals / Glossybox Coupons . The links in this post may be affiliate links. Read full disclosure Save for Later Notification Through 6/30 Glossybox is offering 30% off any length subscription – just use code SUMMER! New plans will begin on the date of purchase and cannot be combined with an existing subscription/order.