How about this one, kinda

Powerbuy in Thailand.
http://www.broadway.com.hk/Also, you could try all the website from manufacturing
www.sony.com.sg or
www.sony.com.hk which, sometimes, has MSRP. I don't think you get much discount.
For parallel import, ie US or Japan models, you can try
www.chineseclub.com.hkEven though it's parallel import, HK tourism authority awarded the quality mark to the shop so I think you can trust them on this. Price of parallel import can be up to 30% cheaper than Asia model. I bought Panny camcorder PV-GS200, an NTSC camcorder, at approx HK$6,500 while NV-GS200, a PAL model, is at HK$9,000 at the time. However, don't be fuzzy asking them what this what that for all the button. They won't have time to do that. Just make sure you know what you want to buy, not asking too much question.
Hv fun