https://www.amazon.com/NEW-Norton-36...3PKK1P1S5&th=1
5 device, 15 month - it goes into your Amazon software library until you're ready to install. I've been buying new keys for Norton Security this way for years, usually for $20 for 5 devices.
The catch this time is that it's auto-renew, so put a reminder in your calendar to cancel before it expires...