The ones by mosaic are very affordable and come in different sizes. I had a small one for my son in my choice of the fabrics they offered for $100. It is large enough for a twin bed. Everyone has enjoyed it, and it was amazing in transforming his sleep. They are a nice and understanding company- I bet they would let you return it if you tried it a week and it turned out poorly

They also sell them on etsy. I don't know if there the same ones as the therapeutic ones.

DiY How To Make A Weighted Blanket For Children W…: http://youtu.be/xcK0ZTKh2sc

See if this is feasible for you...it cost me less than $15

I will also say my daughter was not sleeping, and definitely not in her own bed and this made such a difference. I will try to find the video I used and post the link.

I made my own for very cheap. It is wonderful!!! Since seeing success at home they now use this at school.