I don’t know where to purchase another reading pillow like the one I have. I wouldn’t want to change to another brand since this one has been serving me faithfully. What is the quality or grade of the filling that manufacturers use in these pillows? I would like to refill mine or make another one like this that will serve me well too. What can you advise? If there is no useful feedback on this, can you recommend the best one of that will not disappoint?