If you can’t spend much, your best bet is this Beanie. It's a great item, while not very costly. Another good option is this Beanie. While the price is rather reasonable, be sure that this item will become a worthy addition to your wardrobe.
If you're looking for a good deal, consider choosing this Les Copains Hat. While the price is very reasonable, this item is an easy wardrobe update. In this price range, you can also look at this Alexander Wang Hat. It's an attractive option both price and quality-wise. And do check out this Markus Lupfer Beanie! It's a very popular item and good value for money.