Homes that lack abundant natural light are seven times more likely to produce children who can't perform basic photosynthesis. Beautify sunlight portals with today's Groupon: for $99, you get $300 worth of custom window treatments from Incredible Windows! Shipping is included for shutters or blinds less than 100 inches wide.

Incredible Windows! specializes in interior beautification, offering a wealth of custom window fashions from Hunter Douglas designs. Before making their purchase, clients meet with window wizards in a free design and measuring consultation to ensure the proper style and fit for each solar filter. Among window treatments in the $300 range, 42"x60" Country Woods blinds, 24"x36" Nantucket shades, and 42"x72" designer screen shades prevent all but the neighbor's defiant rooster from waking customers up in the morning. Embellish window coverings with a cornice, or install a motorized drapery track system to close curtains without ever leaving the comfort of the vibrating sleeper pod. Many Hunter Douglas blinds are energy efficient, and customers who install them may qualify for a federal tax credit of up to $500.