Ctrip [
english.ctrip.com].
Have used them a couple of times. Big and reputable agency. I have even seen small service offices in train stations. They will also deliver the tickets to your hotel for free. When I used them in January, I left a credit card number as a deposit and paid in cash when getting the tickets.
Yoee [
yoee.com].
Haven't used them, but good booking engine. Charges a fee for delivery.
Elong [
www.elong.net].
Owned by the same company as Expedia.