Best option is to set an email notification at the official resellers and immediately purchase when notified. For the time being, you won’t have more than 15 minutes to complete your purchase.

If you are US-based, you’ll want to create accounts at the sellers and verify them ahead of time, as vendors are implementing measures to prevent fraud and bots. Adafruit also requires your account to have 2FA active.

This page [0] keeps an updated list of RPi stock. Maybe it could help you find something when it restocks.

[0]: https://rpilocator.com/

Seriously - would love to find one online, event for a tough markup. Not sure when to expect a new wave to become available on the market.