I know there is a Costco coupon thread, but this wasn't mentioned in it. Costco has Muscle Milk Light ready-to-drink shakes for $29.99 with $6 Off Coupon. I don't normally buy this, but for those who like convenience, $1 per shake (20 g protein) is not bad. I think it goes on sale about twice a year or so. Current sale runs from 1/2 through 1/27.
Amazon has chocolate 24 pk. listed at $14.80, but with ~$35 shipping.
Also, I noticed that Costco now has the Clif Builder bars for 18.99 for an 18 pk. Never saw them before, but I know Sam's Club has them already.