In fact, Knockaround sunglasses is one of the most popular glass brands in the United States nowadays. They are widely renown for their nice design and quality. And to be honest they are always catching young people's eyes. Generally speaking, a pair of them would cost you about 100 to 300 dollars, affordable prices, not that pricey. You can easily spot them at large shopping centers or Walmart vision center,etc.
In the online store, the price of knockaround sunglasses can be as low as $ 50. However, there must be some types with high price. If you want to buy one, you may go to the amazon to have a look. There are always many types of sunglasses with different brands and different styles.