Once Upon a Book Club Valentine’s Day Coupon: 15% Off First Box! Posted by Brandy on February 13, 2017. Subscription Box Coupons & Deals / Once Upon a Book Club Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Once Upon a Book Club has a 2 day sale! Now through 2/14 use coupon code VDAY to save 15% off your first box!