If you're after a thrifty option, this Fendi Open Cardigan will fit the bill. It's a fail-safe choice, while not very pricey. In this price range, you can also take a look at this Magaschoni Open Cardigan. It's also a popular item and won't break the bank. You might also want to consider this Theory Open Cardigan. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.