I got the Bluelounge Extra Connectors (Micro USB) for US$5.95 (~S$7.22) for my Bluelounge The Sanctuary as I needed an extra Micro USB port to charge both my HTC Destire and HTZ Mozart at the same time.
If you just ship the Extra Connectors to Singapore, it cost US$2.53 (~S$3.07) for USPS (First Class Mail International Parcels). Since I am already buying the Bluelounge MiniDock, I just need to top up US$1 more for the shipping cost.