Buying Cheap Domestic Flights in China Online

I have been doing a fare amount of research towards my trip throughout Asia and Australia I which begins in a week. I needed a quick and efficient way to travel from Shanghai to Beijing and back but on a very limited budget. I found
Ctrip.com. I purchased a round trip electronic ticket from Shanghai to Beijing for under $150. The tickets are electronic. We shall see if everything goes well once I am in China. I will post my experience after the return.