Yugster offers the Perfectly Plumped King 95/5 Goose Feather and Down Pillow 2-Pack for $28.97 with free shipping. (Choose "King" in the "Style" dropdown to see this price.) That's $3 under the lowest price we could find for a similar 2-pack elsewhere, excluding the below mention. These medium firm pillows feature a 100% cotton shell and are stuffed with 95% feathers and 5% down.
A close price: Downlite Bedding via Amazon offers a similar 2-pack for $29.13 with free shipping.