It's never hard to find cheap Chinese food in Champaign. Just wok onto the Green St. and 4th St. intersection and turn your head one way to find Mandarin Wok or the other way to find Lai Lai Wok. Both are equally good and convenient. It just depends on which side of the street your own and whether or not you want to wok across the street.
Okay, maybe there are slight differences. Lai Lai Wok is supposed to be more Taiwanese, where as Mandarin Wok is supposed to be more mainstream. I can't tell the difference since they have many of the same dishes.
I do like Lai Lai Wok's soups and noodle varieties. The other dishes are also great and is useful for dining family-style. This place is a good bang for your buck.