Good corned beef can be tough to find in the Bay Area most of the year, but in the days leading up to St. Patty's many local places offer it as a special.
Cafe Rouge's butcher shop will have corned beef available a few days before the 17th. This is really good stuff, tender, juicy, nice distribution of fat, excellent flavor. I always call ahead to reserve some, because it just might sell out. I'll pick up some sauerkraut from the farmers' market, some gruyere from the Cheeseboard, a little Acme rye, and Mrs. Mousse will make a batch of her Russian dressing. We'll be in Reuben heaven, East Coast be damned.
Cafe Rouge will also offer a corned beef sandwich on their lunch menu right around the 17th. Since their menu changes daily, you might want to call ahead and confirm.
Fatted Calf will offer corned beef this year. In the past, they've only offered a whole, uncooked roast. Since I don't have a meat slicer at home, I haven't been able to try it. However, with the opening of the new Oxbow market, Taylor says they hope to have cooked corned beef available by the slice (definitely call ahead to check on this). If I can make it out to Napa, I just may need to do a corned beef taste-off.
For those of us who don't want to prep at home, Gregoire has a corned beef sandwich on the menu this month. It's one of his best sandwiches, featuring house made corned beef and sauerkraut.