Was only into detailing seriously in the East Bay before I moved down here. I was in Walnut Creek and new of a place in the Danville Mercantile by the name of Auto Affair. they sold some nice products but their focus was Italian car parts, accessories, and memorabilia. Of corse there is always you local Harley dealer, S100 and what ever they choose to stock.
As far as dedicated retailers of detailing products, I don't know. Yellowbook?
HTH