I've been checking the inventory at my local Best Buys (10% off Mover Coupon). At first, all of the stores listed inventory as being available for pickup in 3-5 days. Now, the 512gb model is listed as unavailable for shipping online and in stores. Does anyone know whether Best Buy will be carrying this model? Is it typical for them not to carry a specific model for some time after launch? Thanks for any help.