If you're not planning on spending much, this Kate Spade Scarf will fit the bill. It's a fail-safe choice, while not very costly. In this price range, you can also look at this Vince Camuto Scarf. It's also a popular item and won't break the bank. You might also want to consider this Karl Lagerfeld Scarf. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking at it like an investment piece, then what you're looking for is this Dolce & Gabbana Scarf. It's more expensive but worth your money. While you're at it, also have a look at this Saint Laurent Scarf. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious Chanel Scarf? Yolo, right?