Not only does Wal-Mart sell at the lowest prices, they must buy at the lowest prices as well. I went to our local WallyWorld for a portable cd case and a couple of other items. I grab a cart and the right front wheel wobbles. So I choose another cart, and there is a knot on one of the back wheels. When I push it it thumps. And thumps. Every cart in the place rattles, thumps, or pulls to the side. There's not a one that rolls straight and smooth!