Not everyone is optimizing for time. The agents will give you the choice of what you want to optimize for.

So you can just tell your agent "Hey X order me a Nintendo Switch 2. I want it by the weekend." Then it will order it for you from whoever has the cheapest price that conforms to the given criteria.

If the local agent has access to your digital wallet (Apple pay or Google pay) and your email then it has all it needs to perform and verify the transaction.