If you sew or know someone who does, its not too hard to make an APEX quilt for cheap. Membrane7 fabric and probably 7.5oz APEX would get you to your target Maybe 10oz APEX if you need it warmer.. Pretty easy stuff to work with, doesnt require "quilting" to hold it in place. Could make a custom one to fit exactly to the perimeter of your sleeping pad. (by the way, Ill second the sleeping pad comments made above... put the money into a good sleeping pad, like a thermarest neoair with a high R value rating, and that will make all the difference in being able to use a quilt comfortably)