Keep your eyes peeled at Karmeliter Market — you're bound to find some unique curio among the stalls here. After you've had a good look at the wares, try some fare from one of the nearby food vendors.
This community marketplace is located in the trendy neighborhood of Leopoldstadt. Karmeliter Market is free to explore, making it the ideal cheap day out. Make sure you have enough time to look around a few nearby sights, such as Schoenbrunn Palace, Vienna State Opera and St. Stephens Cathedral.