I originally found it years ago in a grocery store's imitation flavoring section but it has since become rather difficult to find. You can find it online at multiple retailers or if your grocery store carries it you can use McCormicks Cake Batter flavoring extract instead. That extract is made to taste like vanilla butter and nuts which makes it a really good second place option when you're in a pinch. Torani syrup also makes a butter pecan flavored syrup that can be used for flavoring.