If you are on a limited budget, your best bet is this Nordstrom Scarf. It's a popular product, while not very expensive. In this price range, you can also take a look at this Echo Scarf. It's also a popular item and won't break the bank.
If you're after a bargain, why not look at this Rag & Bone Scarf. While the price is very reasonable, this piece is an easy wardrobe update.