This article from Gamasutra talks about a controller made by In2Games, makers of GameTrak :

“Named Gametrak Fusion, it uses a patent-pending ultrasonic and RF system to track the motion of a Wii-Mote-style controller, using a small base unit on the floor in front of the player. A 3D accelerometer in the controller also provides data on absolute position and orientation. (…) it offers better range and isn’t affected by ambient lighting conditions. (…) a summer/fall 2007 launch (is) scheduled. Pricing is unconfirmed but the base unit and wand are expected to be available for less than £30 ($56).”