I'm planning on trying one out, too. I have two of the AMK Bivvies and 3 of the 2-person AMK blankets. Amazon has a great price and if you "subscribe" you get an additional 15% off, plus free shipping. Right now I'm set up to get one every month IIRC. My plan was to slowly get a stock of them built up in time to include them in my winter car kits and those of my family.
_________________________
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman