If you're not planning on spending much, your best bet is this Scarf. It's a wonderful piece, while not very expensive.
If you're looking for a good deal, why not check out 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 item 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.