Wish I had known..... but I made my own...just go to Home Depot and look for their plastic/vinyl coated cable (many different diameters)...get some shrink tubing and ferules to match the cable.
Cut to desired length ( I cut mine at 48 inches) strip back the coating, slide on the shrink tubing and slide on ferule, make a small loop and slide the cable into second ferule hole and crimp. Then slide the heat shrink up to cover any exposed cable exiting the ferule and use heat to shrink it.
Presto...done, and it only cost you about $3.00. It keeps honest people honest but a good set of cable cutters can cut through it, like bolt cutters can cut through a lock and chain.
I typically slide the cable through both arms of my jacket and then through my Schuberth C3, loop it through the bike somewhere (I have a BMR shelf that works great) and then lock the ends together.
I did this after coming out of REI and finding my jacket GONE. Broad daylight, right in front of the store...in an very nice area. Thieves are everywhere.
Since then I've come out and found my jacket and helmet on the side of my bike...I leave it on the BMR shelf and thus I've thwarted yet another attempt. Both times there were other bikes parked around me...maybe the thieves are fellow riders and they are just after me.
"Paranoia will destroy ya"