Hi Glenn,
I believe they're consumer-replaceable though I'm pretty sure the lens has to be removed from the inside (raise the hood) as I don't see any visible screws from the front. AutoZone or any other parts house should stock the bulbs, whether or not they're OEM I'm not sure about. I'm going to have to do a lens job on my dad's soon as one of the lenses is discolored so I'm curious as to how difficult the lens assembly really is to remove.
Speaking of Infiniti dealers and parts, one of the coil packs for the DIS (Distributorless Ignition System) went bad on the 2000 I30, causing it to rough-idle occasionally at stops to the point of nearly stalling out, and he took it to the dealer for repair work. VERY simple to change out from what I was told, but they overcharged him for labor. Can't remember what the final charge was, but it was high; not cool. Seeing as how it still rough-idles from time to time, another coil pack is probably going bad, so I'm just going to bring it in to shop class and do it there. It will be interesting to see if they carry those at Big A...
--Austin