Can I buy a Vault before I have a tour?

Yes. The Vault waits, empty, and you create a new tour in it or put one of your tours in it later. The term starts the day you pay, not the day a tour goes in, so do not buy long before you need it. The Vault reads Empty on the Vaults tab. If it still has no tour after three days, a banner at the top of the app says so and we mail you, and we mail you again after fourteen days.

You need an account to pay. If you have none, you make one on the way, and its email address may have to be confirmed before you can pay: click the link in the email we send. Buy a Vault before you have a tour has the steps.