Black and White Sunglasses from buy.com
If you're after a thrifty option, these DG Eyewear Sunglasses will fit the bill. It's a popular choice, while not very costly. Another nice option is these 106Shades Sunglasses. While the price is rather reasonable, be sure that this product will become a great addition to your wardrobe. You might also want to consider these Tru Trussardi Sunglasses. 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, look no further than these Marc Jacobs Sunglasses. This item doesn't cost too much, but absolutely indispensable in your wardrobe.