Others may be able to help better, but If you want really high quality down, John lewis sell 850+ fill power goose down pillows. I think they have 20 ounces in them, which is enough to make quite a bit of gear.
They are £150 quid though. Euro quilt, a scottich firm, sell 815+ fill power pillows for about £120. It may sound a lot but the high quality down lasts much longer than lower grades, so probably works out much cheaper and better in the long run.