It's a $19 button that lasts ~1000 presses and can be used to trigger events on Lambda (which are free for the first million, so no real issue). So what you're

It's a $19 button that lasts ~1000 presses and can be used to trigger events on Lambda (which are free for the first million, so no real issue). So what you're getting is a cost of $0.019 per press. Compared to a button on a webapp (which can be pressed from your phone) that, when pressed, goes through API Gateway and then hits up Lambda? At which point you're paying $0.0000035 per press. Decisions, decisions...