I've never purchased caviar outside of California or NYC and I am having one heck of a time finding caviar in Boston or Providence. I've found salmon roe and some cheap, unidentifiable caviar, but that's not what I want.
My go-to caviar is Tsar Nicoulai, which nearly any Whole Foods outside of New England can order. I would order from their website, but it's too close to New Year's to risk it. I've also gotten caviar from Russ & Daughters and Dean & DeLuca and been very happy. I'm not terribly familiar with Boston or Providence, but Providence definitely doesn't seem to have a lot in the way of specialty grocers or gourmet stores. Can you steer me to some in either city?