I ordered one from Etsy. I wanted particular fabric, plus I wanted glass beads instead of plastic. Not many make them with glass beads. (It's fine, like sand, but well contained within the blanket.)
Monkey loves it! I ordered it somewhat big so if she wanted it extra heavy, we could double it up. (She loves it when she lays on the couch, then I lay on top of her, then Kitten lays on top of me!
)
My only problem is that I have not been brave enough to wash it. I'm afraid there's no way my washing machine could handle it!