Sorry to hear that the latest version 1.7 is sold out. I have three of the Shield v 1.6.1 and they work quite well. Since the Shield is a unique design, I do not know of anyother source other than the Aeroquad Store. The only thing that I can suggest is that you check the Aeroquad store daily and when they are back in stock, buy immediately. I suspect that Mikro will have more in stock within the next two weeks.