thay have changed the boarded crossing at SD so i do not know if you can still get to office there. If you are going to drive or be in Ensenada during the day you can get one there. on the way into Ensenada stay in the right lane and turn on the first street and about a block down on right is where the office is. I will try to explane better, on way in stay right and fallow the coast to town.at the signal where the gas station is the first right is the street. if you get anthony's you passed it. it is the street that runs along the harbor where all the big boats are in dry dock.
you will be looking for the Centro Integral de Servicios next to the Capitania de Puerto. The street is Teniente Azueta.look on google map and you can zoom right to street level.