if you're in a thrifty mood, your best bet is this Pinko Headband. It's a wonderful product, while not very costly. Another strong contender for your wardrobe is this Semi-Couture Headband. While the price of this product is rather reasonable, it will surely attract a lot of attention. You may also want to look at this Deepa Gurnani Headband. This item is not expensive either, but it will make a difference in your wardrobe.
For something in the middle of the price range, look no further than this Jil Sander Headband. This item doesn't cost too much, but absolutely indispensable in your wardrobe.