Mexican fast food is not generally known for being eco-friendly, as a poorly made taco can take centuries to biodegrade. With today's Groupon, green Austinites can make a run for the border while staying true to themselves. For $10, you get $20 worth of fresh, local Mexican fare and drinks at Changos Taqueria, the locally owned and operated little brother of Austin’s upscale, award-winning Mexican restaurant Manuel’s. This deal is good for both Austin locations: 3023 Guadalupe St. and 3005 South Lamar Blvd. Although you can buy two Groupons, you may only use one per order.