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.
Slow down there, Hoss; you can't start pulling heavy weights from the get-go. Let us show you the proper progressions to make your deadlift truly worthwhile.