It's amazing the ignorance in the world. I am in Hawaii, which is part of the US and always have to educate people about shipping. Even the "mainland" 48 other US states don't realize the US Postal Service rates to Hawaii are exactly the same as any other state. They always try to add on extra fees and costs and I just move on to another vendor if they try to jack me around. UPS and Fed Ex, etc., is another matter and does get more expensive because there is no "ground" shipping here.

Maybe you can have a mail service in the USA like Mail Boxes Etc. receive your order, then have them package it back up and forward it to you in Singapore.