I made a handle for Kroc Rows. I had some DB handles that didn't fit the 2" olympic plates and I did some welding and came up with a handle that probably holds around 240lbs in ten pound plates. It's a bit too awkward to use for anything else though.
Prowriststraps sells a $300 handle that holds like 500 pounds or some shit.
Yeah my gym blows. I have everything I need; smith press, barbell, power rack, some good machines, some hot moms. The DB's just fuckin suck though.