Lemur Music is an obvious choice. One of the few bass specialist shops anywhere in SoCal, Lemur is just a short drive north of San Diego proper.
www.lemurmusic.com
See if they'll rent you the huge 7/8 Pollman. Yours for $25,000. They said the Air Force put it on consignment, because "it was too loud." I believe it, too. Playing on that thing has spoiled me for life.