Goldfish (goldfish1395) - Just sign up with vPost to create an account, then u can just order from the Medela website itself. But in the delivery address, put the vPost US address instead of your Spore addy. Medela will send domestically, and vPost will do the international shipping. Cost is based on what you are buying (shipping content) & weight. The Medela PIS is about 4kg, & based on that we estimated shipping to be about S$40-50. Like shazz said, vPost has a S$15 discount for shipping cost of >S$40 now, so quite worth it.
Ladies - I am assuming that the PIS comes with a build in transformer (most electronic stuff like laptops do)? So just need an adaptor. If not, its easy to get a transformer here also