If you're after a thrifty option, your best bet is this Roxy Beanie Hat. It's a wonderful item, while not very costly. Another smart option is this Hat. While the price is not too high, be sure that this piece will become a worthy addition to your wardrobe. You might also want to consider this San Diego Hat Company Beanie. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for an item in the middle of the price range, check out this Bogner Fire & Ice Knitted Hat. While the price is very reasonable, this item is an easy wardrobe update. It's also worth checking out this Herschel Hat. This product is ultra popular and, just as importantly, not too pricey.