I have a batch of 8 un-spoken-for nickel plated copper tunable D whistles with Delrin fipples that will be ready to ship in a few days. If you are interested, send me an email to david(at)obrienwhistles.com or a pm. There is also one E available. They are C$65 each, which is about US$52, including air mail.
One of these is a milestone: serial number 400!