There's an original Durst 138 200W bulb on ebay (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=151359150942). I am no the seller, but I'm pretty sure the bulb is one that I traded to the seller for some other parts. I know the bulb was new when traded. Other than that I have no relation to the seller.
I'm posting this because these bulbs are very hard to find and I've had a couple of people ask me if I have one available to sell.
These bulbs are, of course no longer made... and are now harder to find than the proverbial 'hen's teeth'.
I myself, have now only two 'unopened/unused' left out of five that I purchased about 15 years ago... I can only hope that I can live long enough to make use of them.