In NYC (times square) for business, need good but cheap (less than $30) for weeknight / late / dinners
Does $30 include tax, tip, drinks? Do you require a sit-down restaurant? How late is late? 11pm? Midnight?
Blue Ribbon Sushi Bar & Grill or Landmarc might work but be a little bit above your budget and they are more Columbus Circle than Times Square.
If you can take the train or a cab downtown a bit, you have many more options, especially in Koreatown.