I don't go that far south, maybe Levine's in Norwalk?
None of these places carry 'boutique' products, it's almost strictly 3M/Meguiars and a few other mid level brands as they cater to body shops moreso than detailers. It's tough to find Menzerna, Optimum, etc locally. But they are usually up to date on their respective lines, i.e. M105 or Ultrafina and no ancient labels or part #s.