I am going to order myself a Lumi Glow Formotion Clock, but before I do I have a question. There is a GA series of the clock and a GP series of the clock. The GA series comes with hardware mounts and the GP series does not, instead it comes with a sticky pad. The GA and GP are the same clocks otherwise, but the GA costs $42.95 and the GP costs $23.95. What one do I need to order? Does anyone know? A $19 dollar difference seems kind of much to me. Thank you in advance for any information.