If you're on a thrifty budget, your best bet is this Plush Beanie Hat. It's a terrific piece, while not very pricey. In this price range, you can also consider this The North Face Beanie. It's also a popular item and won't break the bank. You might also want to consider this Knitted Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain hunter, look no further than this Echo Beanie. This item won't break the bank, but absolutely indispensable in your wardrobe.