Fresh seafood is usually plentiful in Exmouth. You can buy from the supermarkets, as well as direct from the factory out by the airport.
There are two dive shops selling equipment.
There are two IGA supermarkets next to each other downtown. Ningaloo IGA seems to be most frequented by visitors, and Exmouth IGA by locals. There is a good range, and they are both open from 7am until 7pm every day of the week.
There is also a fashion boutique.
There are ATM's cash withdrawals available in both IGA supermarkets.