While discussing ordering a shotgun through my local Walmart, the gun counter employee told me that Walmart has the volume and clout that very often they will have production runs made of certain products, that they sell in their stores. And not all stores may get to see that product. Once that production run is all sold off, they don't always run more of the same product.
If this gun is only at some Walmarts and not even Crosman has it on their website, that may be more evidence of what the Walmart guy was telling me.
Paul.