If you're a frugal shopper, your best bet is this Leith Beanie. It's a terrific item, while not very costly. Another wonderful option is this Halogen Beanie Hat. While the price is not very high, be sure that this product will become a wonderful addition to your wardrobe. You may also want to look at this Asos Hat. This item is not expensive either, but it will make a difference in your wardrobe.
If you want to splurge, then what you're looking for is this Beanie. It's more expensive but worth your money. While you're at it, also have a look at this Knitted Hat. Yes, this item is expensive, but it does not mean it's not worth it.