I've got a pair I'm keeping, but I'm always thinking about you guys and how you may want to upgrade but you just don't have $2500 to shell out for that rare, new in box old stock from Porsche when it comes up for sale somewhere.
Here's a link to one headlamp on ebay:
97-2004 Porsche Boxster Passenger Side Xenon Headlight | eBay
Will you have to wait a year or more to find the other one? Probably. But you might get it for less money than this one and get a set (eventually) for a little more than a grand, which is what I paid for mine when Porsche was still shipping them.
Just a thought. If this seems too much or you've found a single unit for less money, the idea of buying one at a time still stands as a lower-cost strategy to upgrade from the factory halogens with orange lamps.
I drove home from Austin to Houston last night and I sure did appreciate my litronics. Wow they are sooooo much brighter than the factory halogens.