Found this dated, but interesting location for sale. In the event that things really turn south on this country, you could purchase your very own Biosphere. But then again, it is a sitting duck target out in the AZ dessert.
I checked Ebay, but apparently it is not listed there. The building cost was 200 million. Could it go for more than 1000 bux? There aren't many Howard Hughes's out there these days, are there? But then again, he chose Vegas.