I have a boat in Washington and another on San Diego. I recommend, if you want to do your own work, try Port Townsend in Washington. They should give you a good deal even if you have them do the painting.
If your intent on going on south before hauling and painting, I can say that most yards (at least in San Diego) won't let you do your own paint or underwater work.
And most all don't allow spray painting by the owner. In my opinion and experience, spray painting of bottom paint is not recommended. It takes high pressure equipment to get it thru the nozzle and onto the bottom of the boat. Plus the yard would require complete containment of the area, just as they do with sanding (or vacuum attachments on sanders). California yards are very stricked, even with their own work because of the EPA and Cal OSHA.
Also, most all yards won't let you provide your own paint.
However, the bottom prep and 2 coats of paint for my 53ft power boat was just a little under $500US. The overall yard bill was a lot more than I want to admit (to myself).
If you have an opportunity to haul in BC or even on one of your many Public Grids, then I recommend that. There are very few grids left in Washington and the ones that are belong to individuals or clubs. I know of one that I use for my 38 ft sail boat but can't recommend it because the "owner" wants to keep it "under the radar". Nothing wrong with a grid if you tarp the landing area and clear/clean up all material before the next tide.
s/v Good Intentions (Ingrid 38)
m/v Wave (Huckins 53)
Ingrid 38 (buider/owner), Huckins 53 ('61)