Some of you may know that it is possible to buy a deluxe version through Self-Realization Fellowship.
They are beautifully made and highly portable; they cost $45 plus postage which can of course be expensive ($39 to UK). I have not put this information on the Initiates sites as the majority of them would not be able to afford such an item.
The link is: http://bookstore.yogananda-srf.org/product/meditation-armrest/