I was in the Somerville Market Basket today. They kept advertising the lobster over the loud speaker. The guy was saying things like, "this is an unadvertised special, today only, no rain checks." Hope the lobsters will still be there for you tomorrow. Good Luck.
Woburn Market Basket hard shell lobsters for $3.99 (though I don't understand the difference between the two as my husband dives during the season for lobster and they aren't any different in terms of taste or texture). Made the Barefoot Contessa's paella - yummy!!