If you already have a dog in training and need equipment, gear is widely available online from specialized retailers:
: Offers specialized service dogs for people with physical disabilities, hearing loss, and children with autism. Alternative: Self-Training
Purchasing a service dog is a significant decision that involves finding reputable organizations that specialize in breeding and training animals for specific disabilities. While "buying" a service dog can cost between depending on the state and training required, many people obtain them through accredited non-profits that offer dogs at no or low cost to the recipient. Where to Find Service Dog Providers
: Provides ergonomically designed harnesses suitable for working dogs.
: A manufacturer offering a wide range of vests, patches, and ID holders.
: A common source for general service dog vests and accessories like "doggles" for eye protection. Service Dogs - Canine Companions