We dispatch from the UK on working days, so there is nothing to pay at the door.
One pen. Delivery is added at checkout, and you see it before you pay.
Two pens. Delivery is on us.
The carrier and the cut-off time for same-day dispatch go here before the first order ships. Until then: order, and it leaves on the next working day.
UK only for now. Everywhere else: leave your email on the pen page and I'll tell you when.