This is better and infinitely cheaper than store-bought, especially if you make your own vanilla extract.

2.5 cups water
3/4 cup light brown sugar
2 cups white sugar
1/4 cup vanilla extract

Add first three ingredients to a pot. Bring to a rolling boil. Once boiling, cook for 10 minutes. Turn off heat, cool at least one hour before adding vanilla extract. Store in a bottle in the fridge.