Le quattro giornate di Napoli

I saw this film when it first came out and it gripped me completely. I was quite young and not "into" foreign films, but this film caught me up. It showed a resistance that was unique -- not planned, not secret, but almost spontaneous. It mixes the buffoonery of some of the characters, the cowardice of a few and the bravery of the people of Naples. Some moments bring tears, others laughter. How the people come together to fight the Nazis who were still brutally exerting their power even as the allied forces marched north in Italy is a powerful statement of the will of ordinary Italian citizens.

For years I've tried to buy it, Le Quattro Giornate di Napoli, with no success. Then this year,TCM showed a very clean copy of it. But still I can't find a place to buy it. It is so worth having --

If anyone knows where I can buy it, I would be grateful.