I have GGS screen protectors on all my cameras. I think the are well worth the small cost. When they are installed you aren't even aware they are there. GGS protectors are essentially permanent. They can be removed by lifting the edges with a razor blade, but once removed they cannot be reused.
I've had no problems buying my GGS protectors from Hong Kong or China.
Gary in SE Michigan, USA. Nikonians membership - My most important photographic investment, after the camera. D4, D810, D300 (720nm IR conversion), D90, F6, FM3a (black), FM2n (chrome) YashicaMat 124, Graflex Speed Graphic 4x5 My Nikonians Gallery & Our Chapter Gallery