As mentioned above Project makes this one still, It seems to be derivative of the old classic Target Wall Shelf (hifi company not red one), Rega also has one.
The Pro-Ject Wallmount It 1 is a resonance-free single-shelf wall mount. It offers playback of your records free from the compromising influence of floor and room vibration.
www.audioadvisor.com
I made a DIY wall shelf using 2 Home Depot Heavy Duty brackets and a piece of heavy Maple butcher block. Works nice. Attached the bracket to a piece of mdf that is screwed into wall studs.
As far as other isolation ideas, some like using the $20 Ikea Bamboo butchers block under there respective tables
APTITLIG butcher block, bamboo, 17 ¾x14 ¼" Easy-care, easy going bamboo – a natural material that adds color and warmth to your kitchen and at the same time provides a durable surface that’s a pleasure to chop and slice on. The weight provides a stable base for cutting.
www.ikea.com
You can get a nice John Boos maple butcher block on Amazon or Ebay for about $100.
A sandbox is another idea. filling the inside of a DIY box with play sand and a top. Some have sucess using air bladders approach like a bicycle tube inder a rigid board.