Nylon Dog Training Long Line
http://www.amazon.com/gp/product/B00KQ7K7QY?ie=UTF8&camp=1789&creativeASIN=B00KQ7K7QY&linkCode=xm2&tag=alspuboca-20
$14.95 - $29.65 (Depends on leash length)

Excellent tool to teach the “come” command.