I haven't been to Costco in a couple of weeks, but they still had the beds last time I was there.
The stuffing is typical polyester fiberfil mixed with cedar shavings. I did stuff a regular bed pillow into each bed and the dogs just LOVE the beds. So far, the beds have held up to countless wrestling sessions and two launderings. They still look "new".
Never make someone a priority in your life when that someone treats you like an option.