Today, I decided to purchase a pair of the Tuna Alley sunglasses by Costa. I thought it's not too expensive since they advertised for a little under $200. Then I called in to ask about prescription lenses, and boy, was I surprised. The same pair with Rx lenses costs an extra $450 or so. I thought they would only cost maybe another hundred, top. So the whole pair final costs is over $600. Wow!!! Does anyone owns a pair with prescription lenses? Does that price sounds right? Know any place cheaper? Thanks!!!