If you're budget-restricted, your best bet is this Alternative Scarf. It's a great product, while not very pricey. In this price range, you can also consider this Hugo Boss Scarf. It's also a popular item and won't break the bank. You may also want to look at this Ben Sherman Scarf. This item is not expensive either, but it will make a difference in your wardrobe.
For something in the middle of the price range, look at this Hugo Boss Scarf. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth taking a look at this Sofie Scarf. This piece is ultra popular and, just as importantly, not too pricey.