EMS's high end down sleeping bag, Pertex microlight shell, 725 fill power, 3 lb 5 oz, asking $185 shipped. Didn't see it on their site anymore, not sure what happened to it, but it used to retail for $450. Includes compression and storage sacks.

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For comparison, in order of weight (all prices from backcountry.com)


Marmot Plasma 0 Sleeping Bag: 0 Degree Down
2 lb 9 oz
875 fill
Pertex quantum shell
$700


Mountain HardwearPhantom Sleeping Bag: 0 Degree Down
2 lb 14 oz
800 fill treated down
nylon shell
$610


Marmot Lithium Sleeping Bag: 0 Degree Down
2 lb 15 oz
850 fill
Pertex microlight shell
$650


Sea To Summit Talus TsIII Sleeping Bag: 1 Degree Down
3 lb
750 fill
2D nanoshell (nylon?)
$470


Western MountaineeringKodiak MF Sleeping Bag: 0 Degree Down
3 lb 1 oz
850 fill
Microlight XP shell
$675


This bag
3 lb 5 oz
725 fill
Pertex Microlight shell
$180


Big Agnes Storm King Sleeping Bag: 0 Degree Down
3 lb 8 oz
650 fill treated down
nylon shell
$360 (on sale for $250)


Rab Ascent 900 Sleeping Bag: 0 Degree Down
3 lb 8 oz
650 fill treated down
Pertex microlight shell
$325 (on sale for $292)


Kelty Ignite 0/EN 9 Sleeping Bag: 0 Degree Down
3 lb 9 oz
600 fill treated down
nylon shell
$350