可以在那兒買到平機票?

Well... There are also a few ways where you can get a cheap ticket...
1) www.zuji.com will have some pretty cheap promotional tickets...
2) Travel agency can find you cheap tickets as well if the date of you flying fit in with their tour group departure... Then they may sometimes be able to get you a ticket as part of the tour group... But otherwise travel agency can still get you reasonable tickets...

These is two main way to get a cheap tickets... But getting a cheap ticket really depence on the time when you fly... As the ticket vary between peak season and low season... As well as Monday to Thursday and Friday to Sunday...

It depends where you want to go. If you want to go to the UK, then buy it from Oasis airline. Anyway, I suggest you to buy it from the travel agency because they can help you to find the cheapest air fare and save alot of time.