If you can’t spend much, your best bet is this Oliver Spencer Scarf. It's a popular piece, while not very pricey. Another strong contender for your wardrobe is this Mango Outlet Scarf. While the price of this item is not too high, it will certainly attract a lot of attention.
If you're a bargain shopper, look no further than this Burberry Scarf. This item doesn't cost too much, but absolutely invaluable in your wardrobe.