the back battery cover you can find the information and discounts for here in my video.... if you use the code in the description you get 30% off your order as well as 2 free screen protectors... all are covered by lifetime guarntee as well... i have the screen protector installed on my device in this video as well and is crystal clear and doesnt scratch easily at all!
http://www.youtube.com/watch?v=MAfKy94YhJg