I bought 3 x 14 days JR Pass, and 2 x 7 days JR Pass for my family's upcoming travel from Prime Follow Me Japan at Hong Leong building basement.
Since they accept payment in Japanese yen cash, so before I went to purchase my railpass, I went to The Arcade building next to Raffles Place to exchange currency (which was 11.10 at the time of my currency exchange), and after that, I went to purchase the railpass using Japanese yen.
Therefore, my railpasses costs about SGD323 (7 days JR Pass) and S$515 (14 days JR Pass).
Although
Japan Rail Pass - Order Online & Travel Japan from $239 's rates seemed cheaper, but bear in mind that they have a S$23 charge for FedEx delivery charge (i believe there's free delivery for orders above $750 though) to send to Singapore.