These tabs have been carried by Safarituff which is Rod Jenkins' company. They are still listed there, so maybe he still has them. There were some posts on here a few months ago that indicated that Scott might be taking a leave from his business for a while.
I like the tab, and hope they continue to be produced. The medium tab fit my hand the best, but the fastener was in the wrong place to fit on my lower finger bone, so I have to put it on my middle finger bone. The large tab would fit in the usual way on my lower finger bone, but felt sloppy. It felt a little strange at first to have the tab fastened to my middle finger bone, but I got used to it pretty quick.