A couple weeks ago, someone asked where they could get moon cakes in the area (see attached). Well, it turns out that Diamond Bakery does moon cake mail orders. Their Web site is:
(Careful, though: the Web site has a music clip on it that just about destroyed my speakers. You might want to hit your computer's "mute" button before proceeding.)
The reason I know this is that I happened to drop by their branch in San Gabriel. I'd been there a few times before, but I had never paid attention to the metal racks behind the counter. Leafing idly through a brochure on the counter while waiting for the clerks to finish with someone else, it dawned on me that those racks were festooned with paper labels for easily two dozen varieties of moon cakes, which were listed in the brochure in gift boxes and the like.
The most interesting item in the list was a Chestnut Paste Moon Cake, but they were out of that. So instead I ordered a Premium Lotus Seed Paste Moon Cake. I wimped out and got it without egg yolks (you can get zero, one, or two egg yolks), which was a mistake because you really need the weird astringency of the egg yolks to counteract the cloying sweetness of the lotus seed paste. In any case, they have plenty of other varieties, such as Black Date Paste w/ Walnut Moon Cake, Pinenut w/ Red Bean Poaste Moon Cake, etc, as well as some other Chinese pastries.
I'm not an authority on moon cakes (e.g., I have to keep stopping myself from saying "moon pies", which is something else), so I can't say for sure which is the best. But Diamond Bakery (which has seven branches in the sprawl and one in Las Vegas) is the most ambitious moon cake vendor that I've seen down here.