Check out Bristol Farms..their prepared foods are outstanding and I would guess their Thanksgiving prepared meals are also.. Also Clementine here in LA, from what I hear, and based on their everyday foods I eat, the prepared holiday meals are superb. These would be my two favorites.
I don't know how your budget looks. But Suzanne Goin's Tavern in Brentwood is serving dinner at $65.00 per adult. And their Larder makes take-out of Thanksgiving including full meal packages on page 4, I believe around $399.00: