Royal Bakery on Mission St. at Russia in the Excelsior has some of the better pan dulce in SF. They had pan de muerto last weekend but they added orange blossom flavoring this year which I am not too crazy about. I believe that they supplied the SF Symphony's Dia de los Muertos event with pan de muerto last year but I am not sure if they will provide it again this year.
Mi Tierra (University and San Pablo) sm. rounds, maybe 8" - plain, sugar dusted, sesame, probably more flavors - $1.79
Everyone was very helpful. They encouraged me to come the next day for the freshly baked ones, but these held up two days later. Delicious sweet bread...
2096 San Pablo Ave, Berkeley, CA