The kit cost $130 total for the lights, PCB, install, and return shipping. It also cost me like $20 to ship it (2 day air with $1000 insurance; the UPS guy looked at me like I was insane).
But it's totally worth it. Very clean install and those little lights are BRIGHT. (assuming the "back light kit" in the subject is refering to the button lighting, that is).
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens,
Greenlights Lit Buttons green set