If you're looking for an affordable item, your best bet is this Poler Beanie. It's a wonderful item, while not very costly. Another strong contender for your wardrobe is this CTM Beanie. While the price of this piece is not too high, it will definitely attract a lot of attention. You may also want to look at this Beanie Hat. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for a good deal, consider purchasing this Blumarine Hat. While the price is very reasonable, this product is an easy wardrobe update. Also consider this Missoni Knitted Hat. It's an attractive option both price and quality-wise.