CurlKit 4th of July Coupon: First Box $4!! Extended! Posted by Hello Subscription on July 6, 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 Fourth of July sale! Get your first box for only FOUR dollars with code JULY4TH! This sale has been extended through 7/9! Visit CurlKit to get this offer.