If you're on a thrifty budget, your best bet is this Scarf. It's a popular piece, while not very pricey.
If you're looking for something in between pricewise, take a look at this Valentino Scarf. While the price is very reasonable, this item is an easy wardrobe update. It's also worth considering this Etoile Isabel Marant Scarf. This piece is extremely popular and, just as importantly, not too pricey. Take a look at this A.P.C. Scarf too! Great value for your money.