I don't think there is any specific music shop in Narita Airport but I know there are bookstores. Not sure if there will be any Ayu CDs available tho (maybe A BALLADS 2 if you go there during the release period). You can see all Narita stores on their website: https://www.narita-airport.jp/en/shops
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Ayu concerts I've been to:
ARENA TOUR 2015 A Cirque de Minuit ~Mayonaka no Circus~ @ Saitama Super Arena 2015.04.11/12
ARENA TOUR 2018 ~POWER of MUSIC 20th Anniversary~ @ Saitama Super Arena 2018.04.07
Tokyo Rainbow Pride @ Yoyogi Park 2018.05.06
a-nation' 2018 @ Ajinomoto Stadium 2018.08.26
LIVE TOUR -TROUBLE- 2018-2019 A @ Nakano Sunplaza 2019.02.06
ayumi hamasaki 21st anniversary -POWER of A^3- @ Saitama Super Arena 2019.04.07
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