Stray shopping carts along the sides of roads are common eyesores. They can also be a hazard to people and cars when improperly left in parking lots. But the biggest problem? They are expensive: They cost about $100 each to replace. When stores need to replace shopping carts, it affects prices, which hurts the bottom line for all of us. The simplest thing to do is to return shopping carts to their designated drop-off points. And if you see a stray shopping cart in the parking lot as you head into a store, push it back. It's these small things that can make a big difference all around.