Thanks for the last minute help with the luau. After wandering around Oakland's Chinatown for about 20 minutes, I did succeed in finding a butcher that could make me a whole roasted pig.
Saturday at noon, I picked up my pig at Yet Sun Market (397, 8th St), with decorations on its ears and tail and cherries in its eyes. It was definitely the hit of the party. They charged me $4.20 a pound. I have no idea if I paid too much or got a good deal. It was not the super tender, melt-in-your mouth kind of meat that I've heard you get with a luau pig, but the store did a wonderful job of chopping it up for me (and then putting it all back together), so my pig made fantastic finger food at the party!
I also discovered "The Hawaii Store" at 44th and Noriega, which flies in frozen traditional Hawaiian foods, and stocks lots of Hawaiian ingredients for those of you craving Poi or Portugese sausage. They also get 14 fresh leis flown in every Thursday (and they go fast).
Finally, a friend of mine advised a bit too late that I could have gotten a luau pig at Roy's Hawaiian Cuisine (might be Ray's), somewhere on 24th Ave (also in the Sunset).