They have /an/ address.
Most of the large vendors have multiple physical locations. The "main office" is often not where the actual material is stored.
Amagi doesn't even have /an/ address. If they do please be so kind to point it out.
Liberty Metals Group has stores in California and Arizona and I have been to both. They have both addresses listed on their website.
AJPM has four walk-in locations listed on the main page on their website.
Gainesville has a showroom with an address.