I misunderstood that last part and thought you meant 10 rolls for 4 bucks and I was going to ask you if you travelled to early 20th century Japan or something
The arcade next to Kmart between Bourke & Little Bourke St has a student friendly soup with things in it bar that's VERY popular. Not costly and very good smelling. Haven't eaten there myself but it sure seems to be a popular option.
Oriental Spoon for lunch special $18 bibimbap or Korean Bento box. Very big portions, very delicious, quite healthy, also comes with banchan (sides of kimchi, seasoned bean sprouts, and fish cake)!
Shanghai st dumplings on Elizabeth if you feel like dumplings..
Bowltiful on Elizabeth - Chinese noodles of various style and meat and sauce... Same as master Lanzhou across the rd