I live near LBI and I make a trip to Skipper's for seafood (it is approx. 25 minute ride from LBI area). The address is: 647 Route 72, Barnegat, NJ 08005-1058
The crabs can be bought live or cooked and the prices are MUCH better than anywhere in/around LBI! A 1/2 bushel cost us about $34 and the crabs were a very good size - we called ahead and reserved them. They have a great variety of seafood (last time I was there they had live crawfish!). Mud City is great too if you don't want to take the road trip to Skippers.