I believe that any buyer can arrange the shipping themselves. You'd have to get a transport company to do it. You call them, you ask for pricing. When you're ready, they send some people and a truck to this guys house. I would doubt he'd have any problem with that as long as he had the money for the tank before hand.
Weight is probably a little more than 600 I would think. My 8x4x2 that's got thinner acrylic is about 400lbs. It took 5 guys to get it off of the trailer and lifted onto my 4' tall stand.