Try In Living Stereo. If they don't have them, they can probably tell you where you can find some.
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I think there's a place in the Chinatown area (maybe East Broadway) frequented by fanatical Chinese (and other) audiophiles into SE tube equipment. A few years back I stumbled into this den of audiophilia and delighted in its very exotic equipment. Sorry, I don't know the name but, perhaps, someone reading this can help.