Seagate 5 GB MD, US$250
Just bought a Rio Carbon MP3 player at Best Buy Plantation, FL and took out the 5 GB MD. Instructions are on DPReview, under Storage and Media. There are no screws securing the case, so you must pry the unit apart to get at the MD.
As I use the Fuji S2 Pro, seems as if I can only use 4 GBs, based on the FAT 16 parameters, which is how I finally formated it using BootIt NG. According the various threads, the Seagate MD works in most cameras.
Seems as if MuVo is coming out with one also, which might be available in Singapore
Hope that this works for you.
Hugh