This was a very neat wine and beer bar in Port St. Lucie, FL. The way it works:

There are about 75 wines, mounted in automated dispensers. You purchase a card "charged" with how much you might want to spend. You then insert the card and choose whether you want 1.25 oz, 2.5 or 5 oz of your choice. The wine is immediately dispensed and your  card is debited.

Very cool way to try lots of wines....