The Tripod Ground Cloth has been renamed. It is now known as the Black Diamond Tripod Bivy/Lightsabre Bivy Ground Cloth.
Here's what other sites are saying:
Free Shipping. Bibler Tripod Ground Cloth (Spring 2008) This ground cloths fit exactly beneath each of Bibler Bivies and are designed to reduce the wear and tear on the floor of your tent.
Black Diamond Tripod Bivy/Lightsabre Bivy Ground Cloth
MSR Hubba Hubba / NX / HP Footprint
$32 - $135
Hilleberg Kaitum 3 Footprint
Eureka! Floor Saver Square Medium
$13 - $21
The North Face VE 25 Footprint
ALPS Mountaineering Tasmanian 2 Floor Saver
Black Diamond Ahwahnee Ground Cloth
Marmot Thor 3P Footprint
$70 - $80