Sargent Fletcher is the company that makes them.
I purchased 16 of them from government liquidation
for a crazy friend of mine that thought he was going to build
SDV's, Seal delivery vehicles - or wet subs. They cost the government
$500,000.00 for the 16 and come diss assembled in a big fiberglass
water tight box 16 by 4 by 4 feet!
He purchased a few fiberglass versions as well but I told him
the buoyancy factor would be easier to deal with if he had the aluminum
versions.
So, to get to the answer of your question - make a reasonable offer on
the fiberglass units and you will own them. They are in Fort Liquirdale.