Available in the East Bay near San Francisco since about two weeks ago, and still in stock, as far as I've seen ...so nice to know I'm not the only lunatic out there who anxiously awaits their appearance.
TJ's has lots of other chocolatey things available only at holiday time, too, even ones with no apparent connection to the season. They have dark chocolate covered ginger cookies, which I'd never seen there before. Good news for anyone who, like me, who always brings Marks & Spencer's version home from trips to the UK.