Not really sure, exactly, what you are asking for.
If looking for the manufacturing plant, can't help you.
If looking to buy used and or new kegs, I can offer this;
www.sabco.com
www.morebeer.com
Just about any respectable OLHBS will offer new and used kegs, Sabco is expensive tho'
On another note, if you don't mind the work, I was able to find several, very good condition Firestone (Pin Lock) kegs at a Scrap Metal Yard for $3.00 each but they required extensive cleaning.
Prosit!