So you’re determined to cook up some lobsters, and you’ve convinced yourself that you can work through the pangs of guilt that come with murder-by-boiling-water (and you’re prepared to go through with it even if your children name them). But you’re still utterly discouraged because of the sorry state of supermarket lobsters who languish at the bottom of their murky tanks with a certain dead-man-swimming ennui. Our suggestion? Follow the advice of Louis Rozzo of F. Rozzo & Sons (the 100-year-old seafood purveyors to such renowned establishments as Restaurant Daniel, Le Cirque 2000, and Nobu) and visit M.V. Perretti (107 South Street), down by the old-school Fulton Fish Market. “You can’t get a better deal on lobsters in the city,” notes Rozzo. With cash in hand (currently between $6.50 and $8.75 per pound) and the fortitude to show up between 4 and 8 a.m., intrepid New Yorkers can not only get their hands on some prized crustacea but also take a brief trip back in time.