It may not have the fancy decor of RA or Zen 32 but Sushi 101 is a great cheap college hangout. You can get $4.50 saki bombs during happy hour every day as well as half off assorted sushi. Although it's not best sushi I've ever had it's well above similar places that compete for the budget sushi category. You can easily stuff yourself for $10-$15. Make sure to try the "fantastic sauce"!