Amazon has 5-lb Optimum Nutrition Gold Standard 100% Whey Protein Powder (Double Rich Chocolate) for $84.99 -$8.50 (Extra savings at Checkout) – 5% off when you checkout via subscribe & save – $20% off when you clip the coupon on the product page = $55.24. Shipping is free.
Note, coupons are typically limited to one per account. You may cancel Subscribe & Save any time after your order ships.