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Brake rotors can be had for next to nothing if you go into a brake workshop, they pull them off and throw them out. I do a lot of brakes for friends and have several old rotors here (I rarely throw any steel items out) because I use them for varying projects involving presses and rolling steel, they bolt together back to back and work a charm. I'm not sure on welding them I haven't tried that, they used to be cast iron and I hated welding cast even though I was the only one in my fabrication engineering class to pass the unit first go (it's all about pre-heating and post-heating, including heating the welding rods).
It would be no good me checking if I have any suitable for you because postage to melbourne is worth more than the rotor but local wreckers if you know what car they fit, you can't go wrong.
I should check if they suit my purpose for my piers top plate, I was going to plasma cut a 10mm top plate and weld a centre I machine up on the lathe, a disc rotor is sounding so easy and I've seen plenty of members on here using them.
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