I'm new to this so I'm not sure if this would be a good deal but thought I would put it out there. I can't afford it but thought if it was a good deal, maybe I could make up for all the great information I gleam from the site. Today only, with this link, you get at least 50% off any thing at sierra trading post. They have a marmot semi-rectangular down sleeping bag that is rated at 40 degrees. It is 1 lb. 15 oz. 600 fill. Since it is semi retangular, I thought it might be easier to make an underquilt. With the link, it makes it only $82.50.
Follow link then search for marmot sleeping bag. I hope it helps and is a good deal. By the way, thanks to everyone for the great information on this site. I just graduated from a nursing program so I am broke, but as soon as I get a job, I'm donating to the site and putting a setup together. I lived in Brazil and slept on many hammocks and think it is the only way to go.