Speaking of Chinese economic style lunch/dinner that is below RM10, Da Kung Zhai (打工仔) may be the only choice in Cyberjaya, as far as I know.

If they are looking for more variety of dishes in an economic rice restaurant, students and employees in Cyberjaya often travel to Dengkil or Equine Park in SK to have their meal, which is usually 15 minutes drive from Cyberjaya.