There is no set date. In store stock is complete and some store sell out quickly and others may have inventory for months and months. Factory heads will be on the shelf in Carlsbad for custom orders until those also run out so not every model or loft will run out at the same time. There usually is enough to cover the occasional warranty claim but even then, sometimes they have to replace with new models. The longer you wait, the less likely you will be able to get the GT models.