Musclepharm Combat 100% Casein 4 lb. Chocolate Milk

$49.99 @ Amazon with free prime shipping.
http://www.amazon.com/Muscle-Pharm-Combat-Supplement-Chocolate/dp/B00KAD4CTW/ref=pd_sim_121_7?ie=UTF8&dpID=51U3dNyY0zL&dpSrc=sims&preST=AC_UL160_SR101%2C160&refRID=0JYB2JTTZ7HK9F46Y2KV

Costco also has deals from time to time at $36 for a 5lb tub.