I'm not sure how complicated your prescription is, but mine is not uncomplicated, and I had surprisingly great results ordering online from Zenni Optical (http://www.zennioptical.com/home.php). As far as a brick-and-mortar location goes, my best friend's girlfriend sang the praises of Union Square Optical (http://www.unionsquareoptical.com/index.php). It looks like they're having a sale just now down there, too.