Club mate had a Trico Iron case I picked up for $75. Even if I don't use it figured I couldn't go wrong at that price. It definitely is sturdy... and I think with proper padding/taping everything so it doesn't move, it'd be pretty hard for TSA to put it back in any way but correctly. A friend has the Biknd Helium he said I could borrow as well. It looks great but I see a good number of folk have had trouble with the air pockets deflating.
Speaking of Biknd, the Oxygen wheel bag looks like a good setup to take the Discs in since they are separate from each other. It seems like that or the Triall3 Wheel safe pro are the options that would fit... Anyone got thoughts on that? (I guess the Oxygen has the same concern as the Helium)