well, we do have a directory:
http://www.tf.sg/index.php?option=co...d=12&Itemid=35

and for websites, you can try searching for "the falcon hangar", toyntoys and u-toys!

http://tfh.com.sg/
http://www.toyntoys.com.sg
http://u-toys.com/

I do know one of the toy distributors and he mentioned that the most important factor lies in the charge of taxes levied on bulk purchases. Anyways, I can keep you guys updated of the pricings!