Where to buy Strap Jack strap locks or similar contraption

[8fingermadness]

Anyone knows where in Singapore that I can buy something similar to the Strap-Jack strap lock in this link http://www.elderly.com/new_instruments/items/SJ1-BLACK.htm?

Recently installed a new endpin on my acoustic and my strap is threatening to slip off anytime. Theres not much space on the endpin to add any clips or whatever so a plastic plug-in jack would solve everything.

Thanks!