As Joe said 3 Rivers has them, but I've made several and they are not hard to make. Hanna Rubber Co. has stock rubber in their scrap shelves from cut off drops they sell very reasonable. I take the old gripper and lay it on the new and trace around it. Then use a box knife and cut it to shape. Then use a hole punch to punch the proper size hole for the arrows. The nice part (other than cost) is if you use skinny arrows you can make your holes any size that fits your arrows best.