By the way I went down SLS to check the price. Either they don't have it or they are selling more ex than IT Show. In the end I went back IT Show and squeeze in again to buy it. Because IT Show Sandisk booth is having Starbuy promotion on it. Worth buying.
Just to share the price for anyone who wanted to get a Sandisk Extreme 16GB SDHC Class 10 30MB/s memory card for your DSLR.
SLS
Sandisk Extreme 16GB SDHC = $78
IT Show
Sandisk Extreme 16GB SDHC = $67(*Starbuy) + Free Lenspen.
Sandisk Extreme Pro 16GB SDHC = $99 + Free gifts (which I dunno what gifts)