Ricky, where is the exact location of Rose in HK? or any sort of badminton store in HK that is trust worthy....I have a friend who is in HK right now, and i have asked them to get me a carlton, so far, they said ab900 is 520....that is expensive!
Address : Rose Sports Goods & Sports Clothing Co - Kam Wong Bldg, near the cross of Shantung Street and Fa Yuen Street, Mongkok (27811809 / 27811601) Most Carlton racquets sells for ~HK$430 there. The one I got was not from Rose, however it was the last unit of that particular shop, and I think they discounted their Carlton racquets because they didn't sell to well. So you are probably unlikely to find another shop which sells AB900 for HK$3xx, however HK$568 is definitely too much (I believe even Sogo charges less). Final tips, make sure not to string your racquet at Rose. They are so poor in stringing (my broken Cab 23 was strung there and cooler said that the damage was likely due to the poor string).
it should be around $350HKD....... just goto digitmall.com and goto their office........it is somewhere in WanChai