I've welded my crankshaft at the flange as a precaution against this type of breakage. All racing R3s (300+ ft-lbs torque) should address this, as it's the next weak point after the clutch basket.
Might also try Copart..
When Jay wrecked his thats where it went too.
Fortunatly is was only about 5 miles from the house so we could go get his accessories off of it....