Update of 2010 post:
Don't know where else they can be found in 2011. But Choe's French Cafe in Santa Rosa is at it again.
From their e-mailer:
Our Galette des Rois is Back!
Celebrated through the month of January, the Galette des Rois or "King's Cake" takes its name from the Biblical Three Kings, and is the traditional French cake served for the catholic Epiphany holiday. The cake consists of flaky puff pastry layers with a dense center of almond frangipane cream. It is a real January delicacy!
Tradition holds that the cake is "to draw the kings" to the Epiphany. A figurine or bean is hidden in the cake and the person who finds "la fève" (literally the broad bean) in their slice becomes king for the day and will have
to offer the next cake.
Alain will be making King's Cake, as described above, through the month of January. Each one serves 10 and comes with a hidden "feve" and a King's crown. $28.50 per cake
Chloe's French Cafe
3883 Airway Drive 145, Santa Rosa, CA 95403