Buy Camcorder at Hong Kong Airport on my way to Guangzhou?

I will be travelling to Guangzhou (China) and my flight will land at Hong Kong where I will need to catch a train to Guangzhou on the same day (may be within the next couple of hours after landing). I would like to purchase a camcorder in Hong Kong before I board my train to Guangzhou (so that I may use it during my trip). Any camcorder shops very near the airport? Or are there shops that sell camcorders within the Hong Kong airport itself? What about the prices? Are they affordable? What should I look for or be weary of? Thanks for your help!