If you're on a thrifty mission, this Reclaimed Vintage Hat will fit the bill. It's a fail-safe choice, while not very costly. In this price range, you can also take a look at this Polo Ralph Lauren Beanie. It's also a popular item and won't break the bank. You might also want to consider this G Star Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you want to treat yourself, then you won't be disappointed if you check out this Gucci Beanie. It's an expensive but smart option. While you're at it, also have a look at this Thom Browne Beanie Hat. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious Lanvin Beanie? Yolo, right?