Check out these companies --
Down Quilts
Jacks-r-Better, quilts are $189 to $309 --
http://www.jacksrbetter.com/quilts/
Hammock Gear, quilts are $179 to $269 --
http://www.hammockgear.com/top-quilts/
Wilderness Logics, quilts are $235 to $275 --
http://wildernesslogics.com/TOP-QUILTS_c7.htm
Enlightened Equipment, quilts are $160 to $245 --
http://www.enlightenedequipment.com/?post_type=product
UGQ Outdoor Equipment, quilts are $154 to $279 --
http://www.undergroundquilts.com/tq/default.html
Warbonnet Outdoors, quilts are $255 to $310 --
http://www.warbonnetoutdoors.com/mamba-topquilts/
Underquilts.com, quilt is $160 to $200 --
http://underquilts.com/shop/the-barnaby/
Synthetic Quilts
Enlightened Equipment, synthetic quilts are $180-220
AHE Kick-Ass Quilts, quilts are $179 to $226 --
http://www.arrowhead-equipment.com/kick-ass-quilts.html
If you want to do it yourself, Underquilts.com offers ready made quilt shells that you stuff yourself. Costs the same as if you bought your own materials and did your own design and construction. Wilderness Logics carries down by the ounce at about $7 per ounce and will divide it into half and full ounce portions. Thru-hiker --
http://thru-hiker.com/materials/ -- carries materials and synthetic Climashield at 5 ounce and 2.5 ounce.
As you see most of these vendors are in the $200-$300 range. As you look at offerings and consider price, keep in mind that it will cost you about $120-$160 for materials easily. when we consider cost, scale of production, that these companies are all cottage or small manufacturers with their production in the United States, I think that they are all reasonably priced.