Yeah, I went ahead and ordered one, an adult sized one for a twin bed..to the cost of over $200. I'll post the website from which I ordered this one.
I know it will be beneficial. After the fact, I've seen various sites which give instructions for making them, and I already own the plastic pellets (in my closet) which can be used in making them. I hope to make one (or two) for my twin grandsons who will be visiting next week. One of the twins has issues with ADHD. I think they'll like them.