CurlKit Cinco de Mayo Coupon: $5 Off First Box! Posted by Hello Subscription on May 5, 2017. Subscription Box Coupons & Deals / CurlKit Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification CurlKit is having a Cinco de Mayo sale! Save $5 on your first box with promo code FIESTA5! Visit CurlKit to get this offer.