Extremely high current power source(s)?
Well if money (and space) is no object, I'd look into a homopolar generator. It's a large conductive flywheel that generates a DC voltage from center to outer radius when a magnetic field is passed through the plane of the disk. Good for low voltage crazy high current DC sources. I remember seeing an old ad for a company selling compact 100V 50kA units (well compact as in the size of a couch). The Australian National University used to have a 500Megajoule 2 Million amp homopolar generator, so they can be built real big. Failing that, grab a set of a hundred or so Maxwell Supercapacitors, the 3000F units have short circuit currents of over a thousand amps each at ~2.5V. Or, if you want an even less safe solution, I've clocked Turnigy 6Ahr 90C nanotech Li-Poly batteries at around 750A short circuit (not bad for a $20 battery).