I don't think many plated lizards of any kind are commonly bred. If you want to help that situation, get a pair and try to captive breed them. Then make a big deal about it (yes, really!) and maybe more people will start.
I honestly don't know of a single source for captive bred plateds of ANY KIND.
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~Sara~
5.5 ball pythons
1.0 Black-lined plated lizard (Lizzy Butt)
0.1 Burmese Python (Pixil)
2.1 Pet Rats
1.1 Dogs (Ozzie and Mandy)
0.1 Cat (Isis)
0.0.1 Synodontis Catfish (Big Spotty Fish)
0.2 Convict Cichlids