Zen Japanese Food Fast is one of the cheapest places anywhere in Austin. Forget those greasy pick-up places for a quick lunch. At Zen, you can get sushi or one of their famous rice bowls for under $5.
And you won't sacrifice flavor either. They have excellent and fresh sushi, in just about any combination you could possibly think of. Their rice bowls are also very good, and believe me, you won't need any side dishes to complement any of them. So, if you've only got $5 and no change for tax, this is the place to go in a hurry.