This gas station has a nice location right off Johnston on John J Delaney in Ballantyne. The gas prices are reflective of the area and not usually the cheapest. Also it is very difficult to make a left at any time of day, but especially during the morning, lunch, and afternoon rush hour.
The inside has a very nice selection of all of your typical convenience store products. Their is usually a line at the cash register, so the in and outer will get frustrated.
They have the Kangaroo cups for purchase for the Summer, with refills being $.25.
Overall good place to stop in for a drink or a snack, I would make the extra 3 mile drive to SC if you are concerned for price.