B&H or Adorama in NYC would be good value at the moment with the AUD so strong. But I guess thats at the end of your trip, so that kinda sux ..

Id wait and buy in HK ... that way theres no risk with anything "mysteriously going out of stock" like they regularly do in some of these online stores. Buy in HK and then you got it in your hot little hand and ready to fire it up !!