there are no lccs in china; everyone plays by the same rules. i just checked ctrip -departing wednesday and returning friday-- and found lots of flights for Y720 ($92) on the outbound. the cheapest inbound flights i found were for y1400, but that's probably because i selected "beijing" as point of issue for both legs. you'd almost certainly do better to buy your inbound once you get to wulumqi. most chinese tas can book these fares.