Sourcing down from this a good idea?

I would concur.

Not sure about the quality of that down, but a lot of folks have purchased the pillows at the link below with good results. You can usually get them for $2-$3 per ounce. I think there is something like 26oz in a King/soft pillow. Google can help you find the quantity per pillow if interested.

http://www.ebay.com/itm/MY-LUXE-Soft-Medium-White-King-Goose-Down-Pillow-/350591684447?pt=US_Pillows&hash=item51a0e48f5f

Ryan

It's cheaper to buy down from Feathertex.

Doesn't mean it's necessarily bad down, but there's no such thing as "Siberian" goose down. Geese do not and cannot live in Siberia. That's a branding thing–but I don't know enough about down to be able to tell about the price.

Any idea what fill power you get from the Feathertex 100% down?

A guy on Wintertrekking.com said it was better than 700 fp. I wish I knew myself, but they were out of stock the last time I needed down.