ROC Eyewear have a 50% off discount code which appears to be sitewide. Using it can get you this pair of Calvin Revo sunglasses (with a black/grey frame and revo blue lenses) for the delivered price of $39.97 down from their original list price of $79.95.
What makes this a great deal is that 50% off appears to be a realistic discount value based on what the average market price for these sunnies is at other online stores. Retailers which have these Calvin sunglasses in stock currently include Birdsnest, The Grand Social, JustSunnies.com.au, and Sunglass Connection who are all charging between $72 and $85 including shipping.
If the Calvin Revo's aren't your style, there are another 30 odd styles to choose from in the $79 to $99 price range. A discount code of this magnitude doesn't come around all too often from ROC, so make good use of it before it expires on the 19th May 2014.