http://cabinobsession.com/arched-cabins-for-under-1000/
As always with these types of web-sites/buildings shippping is the biggest cost. Otherwise seems cool and moderately inexpensive at least for the smallest one. I wonder if it could be successfully replicated with local supplies. Below is the actual firms website. No affiliation whatsoever! 
http://www.archedcabins.com/
Snow load engineering would kill it for us.
From their website:
Q. What are the wind/snow load ratings for your cabins? A. Our Arched Cabins meet 2012 International Building Code minimum standards of 150 mph wind speeds and 30 psf (pounds per square foot) of snow loads.
Not an engineer so I don't know if that is good enough.
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