Can I buy a new AirPods case stand alone?

upon a bit more searching I have found this on the Apple Website, it appears the charging case for the AirPods Pro is $99

https://support.apple.com/airpods/repair/service

Yes you can, they should have a stock of them at any Apple Store - I believe they are $79

Here is a link with a bit more information on replacement parts

https://www.digitaltrends.com/home-theater/how-to-replace-a-lost-or-broken-airpod-or-airpod-charging-case/