Buy a standard wrist roller if you want, but a homemade version of PVC pipe (1.5 to 2 inches is perfect) with climbing webbing attached is a cheap and amazing solution.
Check our power-rack version that we made out of aluminum tubing. The beauty of it in a rack is that you can truly test the grip without the shoulders giving out first.
Bodybuilding may never make it to the Olympics, but I believe that Olympic lifting will make it to bodybuilding. In fact, I've always recommended that bodybuilders use Olympic lifting at certain times during the training year.