Hi Agent Kathie,
No, can't help with where to buy it but you can make an approximation quickly enough if you have the ingredients and are desperate. This makes enough for one meal so not for keeping.
2 Tablespoons Dry sherry
2 Tablespoons Hoisin sauce
4 Tablespoons Black bean sauce
1/4 Teaspoon Chilli paste
1 Tablespoon Vinegar - doesn't matter what sort really except not a sweet one.
Just put in a bowl and mix it all up then put on your chicken or pork or whatever and heat through.