For Prime members only, Amazon offers the Optimum Nutrition Gold Standard 100% Casein Protein Powder 4-lb. Jar in French Vanilla for $30.23 with free shipping via the steps below. That's $7 under last week's mention of another flavor and the lowest total price we've seen in any flavor. (It's the best now by $25.) To get this deal:

1. View the Optimum Nutrition Gold Standard 100% Casein Protein Powder 4-lb. Jar for $40.31
2. clip the 20% off coupon on the product page
3. order via Subscribe & Save for a final price of $30.23