Btw, I was politely reminded by store staff that these are not "orphaned" cars, as no Tesla is ever orphaned... but instead "inventory" cars.
I considered buying the demo/test drive unit (at a discount), but also got to see a list of inventory. Not sure if the inventory was from our localized area, or if the list was a national list.
You can go to your store and ask to look at this list, assuming you're truly in the market, and they'll share it with you. I would presume you could call if there isn't a convenient store near you.
In the end there wasn't a perfect, or close enough match to what I desired, so I finally locked in my configured Model S, and it's now in production.
@FlasherZ, probably exactly right, every color I saw on the list, was anything but red, just the common colors.