Marco's is expensive enough at $89, but $110 is really pushing it.

Put a want ad in RGP, Pinside, and Mr. Pinball Classifieds in the US.  With time I wouldn't be surprised if a used one pops up for a heck of alot less than these prices.  Shipping for this using USPS First Class mail would be about $20.

I just had a look on Mr. Pinball Classifieds (parts section), and just search on "coin door".  There are already a few matches there, one guy is parting out a Night Rider EM, and a coin door is listed.  Just ask for the skin, not the whole door, and you may find what you are looking for.