If you'd rather not spend much, you'll appreciate this Coal Beanie. It's a great choice and a good investment. In this price range, you can also check out this Lole Beanie. It's also a popular item and won't break the bank. You may also want to look at this Hat. This item is not expensive either, but it will make a difference in your wardrobe.
If you want to treat yourself, then what you're looking for is this Inverni Beanie Hat. It's more expensive but worth your money. While you're at it, also have a look at this Inverni Knitted Hat. Yes, this item is expensive, but it does not mean it's not worth it.