My shopping partner says that the cheapest roast duck in SF Chinatown is around $12 ~ 13 per duck.
Noted that you are familiar with Marina. We live in SF, but drive to the Cupertino Marina almost weekly, If we don't have time, or just a short shopping list, we hit the one off Hillsdale.
For sales over $50, you get a coupon for 20% of your purchase to use at the food concession. We are pretty careful shoppers, and their prices seem in the same range as Ranch 99. We are always puzzled at how Marina can offer the same prices, and essentially give you a 20% rebate??