Prescription eyeglasses from Luxottica

Price to make an average Luxottica pair of frames and lenses: $30

Price you pay at LensCrafters: Around $300

The Italian eyewear firm Luxottica (which owns Ray-Ban, Sunglass Hut, and LensCrafters) retains a big chunk of the market, meaning it has little competition and can determine price mark-ups.