We ordered our woven polypropelene tubing from the Bundaberg Bag Company, who were the only supplier we could find in Australia that would confidently sell us tubes instead of bags. A quick look through their facebook page shows someone from their end has been involved in a few international build projects - I'm not entirely sure, but the water tank they built in Vanuatu back in April looks a lot like the one featured in a "how to build an earthbag water tank" instructable I found a while back.
The tubing comes in two sizes, 460mm and 350mm. Rolls are 1000m long. I ran the maths as best I could, and I came up with 4x 30kL water tanks at just a smidge less than 1000m. That was cutting it a bit fine for my rough calculations, so we decided to get two rolls of the 460mm as it's best to do water tank walls tick. This way, we'll easily get 4 water tanks and have some left over for experimental practice and the lower levels of the house. We'll probably end up getting another roll of the narrower stuff for the house build, as the upper levels of the dome can be narrow and the lower levels wider, but that's later on.
All up, including delivery from Bundaberg to Canberra, it cost us around $1400. We messed around with the idea of having it all delivered to my parents place in Brisbane and getting them to bring it when they come, but it turned out not to be a huge difference in shipping costs.
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