What is Walmart, I think many people know - at the moment it is the world's largest retailer with the largest network of stores. So, more recently, these guys are selling the Miner Butterfly Labs Bitcoin Miner in their network.

Miner power: 10 Gh / s,
price - $ 300. As you understand, all this together makes mining meaningless. However, the emergence of this kind of technology in the popular supermarket chain (as if it were sold in some Mvideo), says Bitcoin goes to the masses. And in this case, it is no longer for earnings, but just for the fun of it.