Took me about an hour to make one from watching youtube video instructions to finished product. Get some paracord in your favourite colours and do it yourself. Make some spares and sell them to club members and it ends up costing you nothing.I cannot find a supplier either - going to try making one myself as soon as I get a moments free time (2018 maybe) as there are stacks of tutorials on YouTube and Paracord is cheap on eBay
If you manage to find a manufacturer I would be really interested too.
Karl