Where is melon soda sold near Narita airport

My husband and I were in Japan in March and became obsessed with melon soda which we only found at one single 7 Eleven. He's going to be in Narita Airport this weekend for a several hours on travel and I've been tasked with finding out where the melon soda is so he can stash up and return home with it. I know it's sold in restaurants but I need to know where the bottles are.

It is indeed relatively rare to find melon soda in combinis, but you can find it in virtually all supermarkets. There is a bus from the airport to Aeon Mall Narita (bus stop no. 30 in Terminal 1 and no. 3 in Terminal 2).

http://www.narita-airport.jp/en/access/bus/index.html

If you can find a melon syrup at your local Japanese or Asian food shops, especially MEIDI-YA brand, there you can make it at home.
Add melon syrup with soda(1:3 basis), add vanilla ice cream, and cherry(if you like) on top with some ice cube.
http://www.beeboo.co.jp/db_img/item/00007/75748/KLvKc1YgwwQiDTTKZC9M5V...