Option 1: Buy a 3D Camcorder or a 3D Webcam
Right now, there are only three such cameras available...
a) Aiptek i2 3D Camcorder (2x720p)
b) Minoru 3D Webcam (2xSVGA)
c) Fujifilm FinePix REAL 3D W1 Camera (10MP Photos / 640x480 videos)
Option 2: Buy two identical 2-D cameras