Vibration Suppression Pads - designed to reduce vibration time by almost 100% and decrease vibration amplitude - works on any surface - sold in sets of 3 - fits most tripods.
These look pretty close to new - certainly no cracks or splits of any kind. They are $50 shipped new, so how about $35 shipped. For those who haven't seen these, they are like coasters - you stick one under each tripod "foot" so the tripod rests on these and not the ground. It ads about 1/2 inch to the height of your rig.