Martin Fields just released their n920 screen protector. Same base film materials as SGP and Powersupport.
Martin Fields Overlay Plus Screen Protector (Nokia Lumia 920)
Amazon.com: Martin Fields Overlay Plus Screen Protector (Nokia Lumia 920) - Includes Camera Lens Protector: Electronics
Martin Fields Overlay Plus Screen Protector (Nokia Lumia 920)
Amazon.com: Martin Fields Overlay Plus Screen Protector (Nokia Lumia 920) - Includes Camera Lens Protector: Electronics