Costco (in Canada) has 60in X 70in throws for sale right now that claim to have a 700 fill power. The price is right (around $20-ish USD I think), they pack in a small stuff sack and they're lightweight (packaging didn't say how much and I had nothing to weigh them but it definitely felt like less than a pound) so it looks like it MAY be a good deal BUT they're pretty thin so I figure they're probably not all that warm (as the writing on the packaging promises them to be) but they could make a nice summer quilt.
As anyone tried them? I might buy one and see how it feels. It might even be worth it to double up with two of them for cooler fall/spring nights.