Found Loch Duart Salmon!
What I pleasant surprise! I went the small, local butcher this afternoon to get a rotisserie chicken and some potato salad, and, lo and behold! right there in his case was a nice fillet of Loch Duart salmon. In addition, Larry told me that my two regular fish mongers carry the salmon as well, so I'm set. Can't wait to try it. Price seems quite reasonable, especially compared to the wild Alaskan I've been getting.
If anyone in the East Bay is looking for the fish, the butcher shop at Youngs Market in Kensington carries it, as does Monterey Fish and Tokyo Fish Market in Berkeley.
shel