There are a couple of different reasons slow cookers are a great investment for anyone looking to save money. For one, they don't usually use as much electricity as electric ovens or stoves. However, their biggest advantage is their ability to turn cheap, tough cuts of meat into delicious, slow-cooked meals at the end of the day. You don't even have to tend to it; just throw your cheap cuts into the pot, and by the time you get home from work, you've got a great dinner.
And some of the best cuts of meat out there are actually the tougher bits after you slow-cook them all day. Just think brisket, which is extremely tough before it's barbecued.