I only ship to Canada and US but a buyer in Australia purchased a book somehow and then asked if I would ship to Australia. I agreed and sent the new invoice, but she is not allowed to purchase because it says I don't ship there. Anything I can do?

I think it's just a matter of adding the buyer's ID to your Buyer Requirements Exemption List.

How can I mail to a country I have blocked but agreed to mail for one item | Selling

How can I mail to a country I have blocked but agreed to mail for one item | Selling | eBay Canada EN