I am not sure this agency is good or better, but when we booked the ticked, they did have the lowest price for UA-AA(Beijing-Tokyo-Dallas) one-way and Round trip ticket and the girl(last name is Zhao4 probably,I forgot) is nice. We got the number from a friend. of course, the location of Agency in not in Downdown.maybe around Feng1 Tai2 District. Also,I think when the parents apply for visa, it always agency flyers near USA consulate.
010-6396-6840 or 010-6396-6841
I think the name is Yang2Fang2Dian4 Ticket Dai4 Li3 Chu4.
GOOD LUCK.