Boy, I wish I'd held on to the last two sets of those I had. They are getting to be unobtanium these days. The last set I saw change hands was $8K, and there are people asking 6 figures for them. They're necessary for a really nice "original" restoration project, but the really bad joke about them is that if you want to actually drive the car, they're horrible for handling. The first thing I did when I got my '67S was take them off and put some 6" Fuchs on it. The car was so much more stable at speed, especially in a crosswind, that I never went back to the original rims.
The best thing to do is
watch the Early 911S Registry classifieds for them, or Pelican Parts or eBay. Sometimes you can find them on
Samba since the VW guys bought those for their bugs too.
Good luck with your search. You will have to have patience and a boatload of cash ready to dump on them when they come up for sale. Here's one long shot for you--the Big 3 auto parts swap meet is this weekend at Qualcomm. There will mostly be old American parts for sale, but sometimes there are some hidden Porsche part deals available. You have to walk the whole lot and find the right vendor, but if you're seriously looking, I wouldn't miss it. You might get lucky...
TT