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I tried to order the Apple watch series 8 but it says delivery unavailable
iPad Air, iPadOS 16
You would need to speak to Apple Support. No one here can help you with an online purchase.
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Contact Apple for support and service – Apple Support
M1 Mac mini, macOS 13.5.1; Watch, series 7 GPS/cellular, watchOS 9.6.1; iPad Pro 2nd Gen, iPadOS 16.6; iPhone 12 Pro, iOS 16.6; TV 4th Gen, tvOS 16.6; HomePods, audioOS 16.5 and Airport Express w/ Airplay 2