no need to buy it, if you know someone who has one of those wallets that have a chain or just a chain like that, you can take off one of the links (only if they're not soldered shut) and with pliers you can open them an make them fit you just right.
Umm, I think you can buy them on Ebay =) Also, i think they might have some at Sally's (beauty supply house) or a Tattoo shop maybe? Hope I've Helped XD
thank you. i'll try sally's never would have thought of that. (: