I had it in Mishima (Japanese place on Lexington btwn 30th and 31st) a few years back. Not sure if they still carry it. It had a turtle in it as well. Tasted like formaldehyde.
That was homemade, I have never seen bottles for sale with the snake in it in any Chinatown liquor store. Someone else might know. I brought back a bottle from South East Asia that I have in my house though this is more for shock value then to drink.
164 Lexington Ave, New York, NY 10016