Like a diamond, a great head of hair is smooth and shiny and should be kept away from people with sticky fingers. Show off today's Groupon to all your friends: for $150, you get a formaldehyde-free Brazilian blowout at Stella d'Oro Salon in Schaumburg (a $350 value).

The savvy stylists at Stella d'Oro Salon forgo the harsh ingredients of previous Brazilian blowout treatments in favor of a frizz-banishing serum made from sodium sulfite, a preservative found in red wine. The formula lulls hair into a meditative state, creating sleek locks that are more manageable than a dog who's putting himself through obedience school. The softening service takes up to 2.5 hours, depending on the length and thickness of each client's head topper. The salon's dark wood floors and cream walls with tawny accents create a warm-toned setting for the mane overhaul. Guests sink into the salon's padded chairs while a stylist transforms face fringe into a masterpiece fit to be immortalized by a marble bust or a tribute concert performed by awed hair bands.