Fanchest Halloween Flash Sale Coupon: 20% Off Any Box! Last updated by Hello Subscription on October 30, 2018. Subscription Box Coupons & Deals / Fanchest Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification Fanchest has a deal for 2 days only! Save 20% on ANY franchise with coupon code BOO! Are you getting Fanchest today?