15-Pk 11-Oz Premier Protein 30g High Protein Shake (White Chocolate Raspberry) $19.95

15-Pk 11-Oz Premier Protein 30g High Protein Shake (White Chocolate Raspberry) $19.95. Went to Walmart earlier to pick up a few things and notice a wall of Premier Protein Indulge Raspberry & White Chocolate was $19.97 which equates to $1.33 each. That is the same price as Costco's current Premier Protein sale, but Costco doesn't carry this flavor. This is ONLY for the Raspberry & White Chocolate, no other flavors are even close to this price. Sams Club currently sells this for $26.64. Also, Walmart doesn't usually have 15 packs of Premier Protein, they usually only sell 12 packs. I wonder if this was an order mix up with Sams?