Shipping containers for instance do seem logical, although there isn't always a plentiful supply (there was a shortage earlier this year), but they can be brought in quickly. Reference them being "homes" I don't think our housing covenants would allow them, but I do know of a small business building being built of them in Seattle.
In some countries the bamboo option would certainly be a good one, and probably used there anyway. I didn't realize how strong those structures could be.
Then there is the sandbag shelter. Resembling the sod houses of the early western plains pioneers, it isn't mentioned, but they would be good nuclear radiation/fallout shelters too.
Check out the last one on the list, Concrete Shelters
What I tell people in my disaster preparedness presentations is that you should prepare your home as your shelter. It is the best place to stay if it is not in harms way. Don't be relying on sleeping on a cot in a gymnasium when you could be home in your own bed.
Lastly, based on their experience, which one should the three little pigs chose?
