Try Dogs Afield or one of the other catalogues. I just use the same ol' couple dollar lead I've had forever. Snap end through the handle to form a "collar."
I had a guy make me one out of para chord and it looks awesome, has a twist to it, and is a slip kind, hit me with your e-mail and I can send you a pic, he made a couple for me, I could part with one if need be.
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