The only two places I could find it online are these,
one where it's 57 dollars- http://www.jmarket.com/yugioh-puzzle-charm-strap.html
And here : http://coseyes.com/goods.php?id=7700 Where it's 8 dollars but they don't ship to the US.
If anyone knows where I could possibly get my hands on one, help a girl out! DX
(If this kind of post isn't allowed...I'll take it down. But I'm desperate for help on this!)