Marty's Liquor in Newton has Plymouth gin on sale for $15/bottle.
They also have Creme de Violette on the shelf -- and all the other Haus Alpenz offerings in stock, too. A fabulous selection all around, actually. We were pleasantly impressed.
I was inspired to pick up a bottle of Austrian cream liqueur (the cream liqueur of my people!), and Husband just had to try the Austrian stone pine liqueur... I felt pretty on-the-pulse when I saw that Chuck Taggart had blogged about this same stuff right about the same time I was purchasing it! Husband invented a cocktail that used the pine and it added a really interesting, refreshing note -- I think it'll be great for summer. Once he comes up with a name for it, I'll post his recipe.