I like Ommegang a lot, too. My girlfriend and I went to Portland, Maine last spring and aside from having an amazing time together we noticed that there are microbrews all over that city.
Boston, specifically Cambridge, has a very good beer selection because there is a big hipster community there. I may roll my eyes at hipsters, but a lot of them seem to know their beers really well.
Do you mean rare in terms of how often you see someone wearing them, or rare in terms of who makes them?
If it's the latter I may disagree since even Allen Edmonds and Jos. A Banks carry a wholecut shoe in their line up - it's not like you need to pay a premium and go straight to St. Crispins or G&G to be able to own a pair.