Grapes naturally exist in three forms: solid, liquid, and raisin. Imbibe the fruit's most drinkable state with today's Groupon: for $25, you get a $50 wine-tasting card at Just Grapes.

Cramming shelves and cellars with a wide selection of international wines and a flood of ales, lagers, and liquors, Just Grapes’ quartermasters keep cups raised with their spirituous wares. Using a preloaded wine-tasting card, tipplers sample up to 24 wines from the automated, self-serve tasting bar, gleaning the knowledge of a sommelier’s apprentice without the years of training or pop quizzes on the history of cork. Customers lift a glass to the wine spout of choice, press a button, and sip the flavor of one of 8 different white varietals and 16 red varietals from around the world (pours range from $0.50 to $5.00/taste). Costs are automatically deducted from each prepaid card, allowing tastings to continue uninhibited.

Cellarmasters rotate wines on a monthly basis, and an automatic nitrogen-preservation system keeps the aged grapes chipper. The down-to-earth staff boasts an encyclopedic knowledge of vineyard ins and outs, educating guests with dissertations on sweetness and mouthfeel, or wowing crowds with a demonstration of how many grapes they can fit in their mouth at once.