well over here we got some basic ones, without the water systems fitted, but we have thermal walls on the north facing side and we have all the window vents etc.
The biggest cost was the plastic, since they only sold this in bulk and we had to buy a roll at 900 euros but it is better than the plastic windows we used, these cant handle more then 2 years in the cold, the wrap system is still going strong.
The timber costs was about 400 euros for a 3.5m dome thats the height of the ones I use in the garden, the work ones are much bigger. Alan knows the full costings mate, I just use them :) In plastic, eg not the heat wrap, the cost per unit was about 800 euros I think he said, but then we had to build it ourselves and we made mistakes first time which we dont now. We got a dude can knock them up quickly and cheaply now, thats the good thing about Esti, lots of skilled wood workers and timber.
They sell for stupid money bro, if you can make one, you can save a rack of cash and who knows if you are good, make them to sell on locally. They are awesome for high wind and low temps, they work well in the heat, the shape of them is conducive to a really great environment. If there was anything better, do you think the eden project would have used that and not a bio dome to preserve all plant life in a massive dome in the UK
http://www.edenproject.com/