If you're looking for fully cooked whole suckling pigs in the Boston area, Midwest Grill, a Brazilian restaurant in Cambridge, is a great option. jeneff recently ordered two for a party, and they were excellent: "tender, falling off the bone, good flavor."
The cooked pigs weigh between 18 and 24 pounds each and cost $160, which includes a side dish of your choice from the restaurant.
Midwest Grill [Inman Square]
1124 Cambridge Street, Cambridge