..at several vendors, this was just the first one I pulled up.
You're looking at a month or so wait for delivery at the most if you order now.
Yesterday they still had first batch available so maybe other vendors still do too.
I don't think the pi5 will suffer the same availability issues the pi4 has
Check out tailscale (or headscale)
It lets you connect those devices without necessarily sending all data through your home network when you are remote. (Though that is an option along with many other great features like ssh authentication)
It also uses WireGuard for the backend which is more secure and efficient than openvpn.