Weighted blanket recommendations?

I've always wanted a weighted blanket since I was very young, but professional made ones are so expensive! I'm on benefits and unemployed so getting these are out of the question. I had a therapist in the past recommend cutting holes in a duvet and putting sand bags in it but I'd have no room to put that away if I don't need it.

I've always found weight to calm me down when I'm heightened and/or experiencing high levels of distress, what recommendations do you have? Thank you 😊