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
Hilleberg Kaitum 3 Footprint
MSR Hubba Hubba / NX / HP Footprint
$30 - $49
Eureka! Floor Saver Square Medium
$13 - $17
ALPS Mountaineering Tasmanian 2 Floor Saver
The North Face VE 25 Footprint
Marmot Thor 3P Footprint
$70 - $80
Cabela's Alaknak II Tent Floor Liner