WTB: -20 to -30 Sleeping Bag

Looking to get a sleeping bag rated in the - 20 to -30 range for winter camping and hopefully an expedition or two.

Figured someone might have one of these taking up space in their house.

I would really like a down bag (not synthetic) by feathered friends or western mountaineering.

But if you have something let me know what it is and how much you want

Thanks