I would be happy to sign you up with Moose Pet Wear. We make collars, leashes, and a few other items. You can get a breif overview of our products at our website http://www.MoosePetWear.com.
I would plan on attending SuperZoo in Las Vegas September 14-16 at the Mandalay Bay and the HH Backer Christmas show in Chicago at the Rosemont Convention Center October 8-10. These shows are for industry professionals only. So you have to pre-register. They will have hundreds, if not thousands of vendors looking for people just like you looking for products for their stores.