FabFitFun Upgrade Deal – $10 in Add On Credit! Posted by Brandy on October 24, 2016. Subscription Box Coupons & Deals / FabFitFun VIP Box Coupons . The links in this post may be affiliate links. Read full disclosure Save for Later Notification Through Tuesday upgrade your FabFitFun subscription to an annual and get a $10 upgrade credit! PLUS, you’ll get early add-on access on October 31! FabFitFun Editor’s Box is now available – New members can save $10 with code Fab10.