I just fell into a cheap source for robot parts. In fact, I got them free. It seems your local hospitals have disposable items that must be thrown out if they are expired. I came across a bunch of these "graspers" at my local hospital. THey were happy to give them to me rather than throwing them away.
They are surgical steel and plastic with considerable grip and rotate at the hub. The silver one is 9 inches long and the black one is 18 inches long. Could make really cool grippers for a small to medium bot. I also got some guide wires in sleeves which are great for linkages to servos. Just worth checking out.