I was in NYC last week and looked in Chinatown and Kaluystan's and could not find sour orange juice anywhere! The Caja China is the latest fad for making roast pork, and the apparently traditional Cuban marinade uses sour orange juice as the primary ingredient. I did a pig in the caja, and substituted lime and orange juice for the sour orange, but would like to find the sour orange juice. Any sources??