You might try Valley Vet Supply. They are mail order, they also have a web site.

Can I ask why you need to hobble your goat?
Hobbles can also be made quite easily. We use cat collars to hobble one foreleg, and the opposite rear leg and run a piece of rope or chain between the D rings. This will allow the goat to move freely but not jump the fence.
Chicken peck stuff can usually be found at a local feed store as well.
Sarah 'My Small Farm Expert'