Muscle Milk Single Bars for $.50 at Kroger! (Normally $2.39) Posted by Harbor Master on 7 October 2017, 11:30 am Tweet The Coupons expire 30 days from print (The print limit is two of each coupon) Click here to print a coupon for $1 off any One MUSCLE MILK Bar Through 10/16, Kroger has Muscle Milk Blue Bars on sale for $1.50. Just $.50 after the $1 off one coupon above.