If you'd rather not spend much, your best bet is this Beanie. It's a fantastic piece, while not very costly.
If you're looking for an item in the middle of the price range, you're in luck with this Eugenia Kim Knitted Hat in stock and waiting for you. You are bound to fall in love with this product. It's also worth considering this Sofia Cashmere Knitted Hat. This piece is extremely popular and, just as importantly, not very expensive. And do check out this Helmut Lang Beanie! It's a very popular item and good value for money.