Maybe on the lighter side - here's a place to post cheap or free tweaks.
I'll start - For two different vibration isolation ideas:
1) Cut a piece of flat wood into a 1.5" square. Glue some thin cork sheeting onto the wood (I like Gorilla Glue). Use a Dremel tool to sand down the rough corners from cutting, if you go crazy, your isolation puck could be round. Oooooo.
Make 3 or 4 of these and suspend gear. Listen and immerse.
2) Advanced alternative - Cut handle off spoon. Sand rough edges from cutting on bowl of spoon. Glue bowl onto blocks made under 1), above, using a glue gun. Obtain large, lead shot from sporting supply store. Place one ball into each spoon and carefully place equipment on top. Voila - your CDP will "float". A variation would be to use steel shot instead of the lead balls which would increase the lateral float but decrease advantage from varying material density.
Try this before spending lots of money on roller balls.