I buy my stuff from
www.buydig.com. But just buy the body/kit with nothing else, cuz the tend to overcharge for the accessories which are usually unknown brands. Their prices are good and reliable too. Have many friends who have bought from them.
Just a note to consider, for camera bodies, the warranty is usually limited to the US, so it might not be valid in Singapore. And also another note, some online shops in the US do not take foreign credit cards and do not ship to hotels.
Happy camera shopping the US...
