I bought mine from www.ellisfibre.co.nz who sell via the internet. I am sure if you contact them they will help you find one closer to home or will ship on too you. Don't get too frightened of the cost, it is in New Zealand dollars. Perhaps any store that sells linen, duvets etc. would have one. After Boxing Day you may be able to find one at a great cost!!
I am now going to look into the magnetic bracelets as I find after a full day of activity I am stiffening up and looking forward to my bed!! I really hope it helps you.