http://www.seattlefabrics.com/ is slightly cheaper for Primaloft. The problem is finding out what thickness to use. BTW, Primaloft 1 is now called Primaloft Gold. I'm pretty sure it's the same stuff with a new name.
From what I've seen, a lot of the synthetic quilts just use 1 layer of insulation quilted to the fabric. I would use 2 layers and quilt one to the outside and one to the inside with the seams offsetting. That takes care of the cold spots. 2 layers of 3 oz makes a total of 6 oz but I can't find anything that tells me how warm that is.
