The golf ball has a tough, rugged thermoplastic cover, but at its very center contains a heart of gold, which swells with every postputt kiss. Discover your golf ball’s true nature with today's Groupon: for $20, you get $40 worth of golf balls from KnetGolf.com.

Winner of eBay Canada’s 2009 Entrepreneur of the Year award, KnetGolf.com recovers preloved golf balls from more than 2,000 resort courses and recycles them to be sold at 50%–90% discounts. The company only accepts the top echelon of recovered balls, and subjects the balls that make the cut to a rigorous scrubbing, as well as a grading system that determines price points and ball self-esteem. For example, recycled mint-condition balls are barely used and like new in appearance; recycled grade-A balls have minor imperfections, including minor scuffs, blemishes, and ill-fitting carpenter jeans; and recycled grade-B balls are much like balls that have seen a few games.

More than 200 makes and models of golf balls are offered, including 2010 Titleist ProV1 ($22.99/$18.99/$13.99 a dozen) and Nike One Platinum ($15.99/$12.99/$7.99 a dozen). Each ball sold is supported by a 100% money-back guarantee, and orders of more than $129 are shipped for free.