Amazon has 24-Pack 8.4-Oz Red Bull Energy Drink (Sugar Free) on sale for $30.21 - 5% off when you checkout via Subscribe & Save - $6 off when you clip the coupon on the product page = $22.70. Shipping is free w/ Prime or on orders of $35 or more.

Thanks to Deal Hunter phoinix for finding this deal.

Note: If you have previously used this $6 off coupon, it may no longer be available. You must be logged into your account. Coupons are typically one use per account. You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to an extra 15% savings when you have 5 or more items in your current monthly subscription.