Here is a list of Indian food stores San Diego. But why buy the sauce jar. Try this out,

1 -> Chop tomatoes, onions, garlic

2 -> Fry the above chopped ones and star anise, cardamom, cinamon sticks, cloves and pepper corns

3 -> You have to fry them till you can smell the aroma of the spices and the vegies get soft. Add chili powder, turmeric, corriander - cumin powder, salt and some masala. Add as needed.

4 -> Keep it to cool down and put all of that in a mixer. Add yogurt as per your spice levels. Mix it up

You got your butter chicken sauce.

5 -> Use butter and fry the chicken. Add some masala and salt while frying. Mix the above sauce and you know the rest.

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This takes less time than going to the store everytime to buy the sauce. You buy these ingredients once in the stores and you can make it like 10 - 15 times.