I am happy to combine postage.  Just choose your postage for the first one, and then choose 0.00 for the rest.  All products are in stock and are sent from my office in Kaiapoi.  I send everything with a tracking number.  CourierPost is an overnight service, but sometimes may take 2 days depending on the delivery courier company, this is out of my control.  You will get an email from my website with your tracking number, and you can check the progress yourself.  Please get in touch with me if there is a problem.