買機票事項，麻煩請教下,,,謝

1a) different travel agents offer different prices, you have to check a few agents to compare with the prices.

b) airline often offers special price if you buy through the website and pay by credit card, but usually they offer just a few seats at low price. After all these special seat price are sold, you have to pay a higher price for other seats.
and you have to check whether the date you fly has such special price.

Perhaps you may notice that some airlines advertise on newspapers/magazines that they offer a very very attractive price for flying, e.g. just HK$300 to fly to Singapore. I had checked with their website and found that this special price seats always fully booked and I have to pay a higher fare for other seats in the same flight.

c) .去深圳搭- there may not be airline in Shenzhen or Guangzhou flying to long distance country. you may have to go to Shanghai or Beijing to take plane. The the cost is much expensive than in Hong Kong.