Hello Subscription » Subscription Box Coupons & Deals » Once Upon a Book Club Memorial Day Deal: Save 15% On Subscriptions! Once Upon a Book Club Memorial Day Deal: Save 15% On Subscriptions! Make the first comment!By Hello Subscription. Last updated May 24, 2020. Hello Subscription independently researches and reviews the best subscriptions and products. Things you buy through our links may earn us a commission. Save for LaterGo to commentsNotification Once Upon a Book Club has a Memorial Day sale! Take 15% off your new subscription, starting with the June box, with promo code 3DAY at checkout! This coupon code is active on longer-length subscriptions! Check out all our Once Upon a Book Club reviews to find out more about this subscription box! Visit Once Upon a Book Club to get this deal!