Looking for thin braded metal security wire

I have a electronic device that I always worry about losing/disappearing of my desk. It has a small hole for a security wire, but none are sold. The unit is a HP Jornada 720 PDA. I went on the Jornada NG and could not get an answer, I wrote HP, nothing selling there. Where can I buy this wire the stores use to secure their merchandize to the counters. It looks like a very fine braded wire, and then it's held together by some crimped devise, probably squeezed by a pair of strong pliers. Where do I get this stuff? Any help is appreciated.......Peter