I saw this at Arrowhead Alpines in Michigan last summer. Gorgeous thing. It's in their catalogue this year. Two year plants, $45.00. Excellent nursery. This is the sort of thing I would mail order if dead set on getting it. Otherwise you have to wait until it shows up when you're looking for something else. You might check Behnke's, they can surprise with the rotations they carry :) In local papers you might find a $25 off on $75 purchase coupon this week.

I just ordered this from Heronswood out of PA. I don't suppose you can pick it up, but at least it's being sent a very short distance. Hope this helps. I've never actually seen one, but it looked beautiful in the catalog.
www.heronswood.com

I've been doing a lot of web-surfing today and came across a nursery that sells "silberlocke" along with a lot of other interesting conifers. A friend told me about it--they've gotten a lot of specimen plants there and really enjoy the owner of the place. It's called Susanna Farm Nursery in Boyds, MD
www.susannafarmnursery.com