Lots of used poly iso available online and Craigslist. Prices by the truckload are pretty good. The older polyiso is better than some of the newer as the older used better gasses for insulating. The newer stuff looses it's effectiveness much faster.
As for round houses... It didn't go too well for the Dymaxion house as only one has survived. Round is not a good shape for people or their belongings. Lots of wasted space that you end up needing much more cubic feet of round to equal the same usability as a square would.
Also with houses the master bedroom always goes on the first floor as does a seccond bathroom. Spare bedrooms upstairs if you really have to have a two story house. One story houses are much more livable especially as you get older.
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