Well the lady @ RS wasn't much help, and I have no car here, so can't really go shopping around. I will be able to cruise around and look this weekend, but yeah someone told me before it's only the 5V that matters, (naturally if you had a 9V it would blow the fuse and overload the player causing it to disfunction), but the as long as it's 5V, the 2400ma MUST BE MET for sufficient power/charging; if it goes over, I don't think it causes anything bad.
Anyway, when I called Creative about when they would get "their" adapters in, I said if there was an alternative I could buy somewhere, and naturally he said no, because you "have to follow the exact specs listed that go with the Jb3, and wouldn't recommend plugging anything else into it."
I am still on my quest. Hopefully I will be able to use my fullycharged Jb3 on Saturday. Thanks Brian.