the Oriental 188 Mall in Wanchai on Wanchai Rd. and Wood Rd. (the store on the top floor, to be exact) is known to probably have the best price (many Tower3A forum members go there first), if not one of the lowest. I tried haggling since I was about to buy a bulk of stuff at HK$400, but they said they already have the most competitive price, so no deal. Thing was, they were right, and I probably spent double that amount there on my most recent trip.
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My blog on Asian films - http://thegoldenrock.blogspot.com/
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"So one day we may find ways to get this Chinese guy some groove"