If you're on a thrifty mission, this Asos Beanie will fit the bill. It's a foolproof choice, while not very expensive. In this price range, you can also consider this Hat Attack Hat. It's also a popular item and won't break the bank. Or you can choose this Asos Hat - be sure you'll be making a stylish addition to your wardrobe.
If you can afford to spend a little more, why not check out this Johnstons Beanie. While the price is very reasonable, this piece is an easy wardrobe update. You might also want to take a look at this Johnstons Knitted Hat. It's an attractive option both price and quality-wise.
If you're in a Treat Yo' Self mood, then you won't be disappointed if you check out this Markus Lupfer Beanie. It's a costly but smart option.