I have been able to get it for a few years now, either Total Wine or Bevmo carries. There are quite a few local brew pubs who have it on bottle.
Good stuff!!
That is great to hear.
While I like all of the Belgian quads, I think that Trappistes Rochefort 10 is probably about the best of them; it is certainly better than St Bernardus 12, (which is very good).