Sony TDGBR100B 3D glasses

Sony's active-shutter 3D glasses offer about 100 hours between charges, and auto-standby to improve efficiency. They cost $149. You can use these with your your HX800 or HX909 TVs (or the LX900, which includes 2 pairs already). For the HX800/909, you'd also need the 3D sync transmitter (which costs $48). You also need a 3D-player (such as Sony's 3D Blu-ray players). 

Buy the Sony 3D glasses now for $149.