Thanks for your thoughtful replies. I am planning a meeting with the manager of the local limestone quarry here. Scoria is just not available within any driving distance that we can afford or, afford to have delivered. We can purchase small amounts at the building store an hour away but that won't be economical for building the entire dome complex. We are using Owen Geiger's Eco-Dome II plans. I do already have near 1,000 poly bags so if I decide to go that route we have a good head start on that part, I also have done enough research to know how to get more to me at a reasonable price.
Delivery will also be a problem I'm sure. We live in the mountains, literally. We are lucky enough to live close to a fairly well-maintained road. An 18 wheeler would be able to get to our property and possibly unload at a flat area on the lower part of our property. But our building site is about 1/3 mile up a windy, narrow, bumpy driveway with very little space at this point to turn a vehicle around in once at the house site. I do know a gravel truck can make it up there as we had some gravel delivered last year. Thanks for the reminder about the amount of material needed and the delivery of the material, it will help me in determining the final cost and method.
We "left civilization" about a year ago actually. Before we moved here we brought load after load of things we thought we might need for building, but in the end, it turns out that due to circumstances during this year of living here our plans have changed and some of the building supplies are just not going to work any longer. Some are, and it's wonderful to already have windows, doors, etc.
I really wish we could use our "dirt" locally we call it "moon dust" it's actually very fine granite dust. We have about 6-12 inches of this dirt and vegetation roots on top of huge granite rocks. Unfortunately, the dirt on the property wasn't something we were really looking at upon purchase.