Your best bet, especially since you live in Orange County, is to subscribe at a Japanese bookstore such as Kinokuniya or at the bookstore within Mitsuwa Marketplace at Costa Mesa. Just like at a comic book store, if you subscribe they'll pull and hold your copy for you when it arrives in the shipment. I don't know how payment works (in advance, probably) or how long you have after arrival to pick it up; those are the kind of things you'll have to ask them about. Hope this helps...
'mom