If you're looking for a thrifty option, these City Chic Dungarees will fit the bill. It's a fail-safe choice, while not very expensive. In this price range, you can also look at these One Piece Overalls. It's also a popular item and won't break the bank. You might also want to consider these Madewell Dungarees. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.