650 Fill Down

I've been looking for a good deal on down fill…

Here are some pillows that (alternately) list the down fill as "650+" or 700, Siberian Down.

http://www.overstock.com/Home-Garden/Milano-800-Thread-Count-Siberian-White-Down-Pillow/3370035/product.html?cid=123620&fp=F&ci_src=14110944&ci_sku=11457823-000-002

The King Size pillow is filled with 36 ounces of down, for just 67 bucks?

Tell me… is this a good deal, or is the rating on the down for such things usually way way off?

If correct, this would be a great way to fill an underquilt for my hammock. :D

Any input would be appreciated!