Here's a family owned panel supplier based in Washington State. Sing Square Log Homes makes lightweight, strong cut-to-size insulated panels. They are green in that they use recycled and renewable materials, little energy, and last a long time so they don't need replacement. They save space because they include siding, insulation and floor substrate in just inches. singcore dot com/index.html
ED: link edited. There were three posts in different topics all with links to the same website. Has the appearance of advertising, but may be useful to someone. Copy and paste the url listed above and replace dot with a period . - MD
Interesting product. Here is a link to some uses in Tiny houses - https://plus.google.com/photos/111885244236246151539/albums/5647875572707936705 (https://plus.google.com/photos/111885244236246151539/albums/5647875572707936705)