At Groupon for $12, you get any pair of Feelgoodz flip-flops (a $30 value, including standard ground shipping). This Groupon can be redeemed online starting on August 27 and must be redeemed by September 28. For flip flop connoisseurs out there, these are made of rubber - not the cheapie foam - and many compare these with Havianas. These are all-natural Thai rubber flip-flops with a focus on total comfort and sustainability. These are eco-friendly and will biodegrade when you are through with them. Giving you another reason to feelgoodz about your Feelgoodz, the company will donate a portion of Groupon proceeds to the educational organization Drop the Chalk. This will be sold until midnight tonight.