Yeah, ive been buying them off ebay, cheapest source I could find because of the free shipping.
west covina nissan in CA, 143 shipped.
370Z GENUINE NISSAN FAIRLADY Z34 ILLUMINATED KICK PLATE : eBay Motors (item 160408556716 end time Mar-28-10 15:19:53 PDT)
Also, yes your plastic kickplates pop off, and these illuminated ones pop in their place. no tools are necessary if you use your fingernails to pop it off. the kit you buy for 143 includes the wiring harness and its all plug and play. tells you exactly where to plug it in and run the wires. I'd rate it a 2 out of 10 in terms of how hard to install.
send me a PM and we'll talk.