I've been making my own for some time:
2 cups pineapple juice
1/4 cup packed brown sugar
1/4 cup soy sauce
1/4 cup catsup
1/4 cup rice wine vinegar
4 garlic cloves, minced or pressed
2 tbs fresh grated ginger
2 tsp chili garlic sauce
Fresh lime juice doesn't hurt
Bring to a boil, then simmer until reduced to about a cup. Make a double batch, you won't regret it!
Marty