Turntable isolation platform Recommendations?

As for cheap isolation platforms, the Townsend looks to be OK. It is a plate sitting on 4 damped springs. Because it is sitting on the springs and not hanging from them it will have a tendency to be unstable particularly with a heavy load as there is nothing to keep the springs from moving laterally. A hanging suspension will always bob straight up and down. This type has a tendency to bob all over the place. Just ask anyone who has owned a Linn.

Short of an active anti-vibration platform, the most effective at isolating things from external vibration and killing self generated vibration is something like the MinusK platforms.  These are used in industry and laboratories.  They are also used under turntables, with some very expensive tables actually being built to work with their platforms (e.g., Swedish Audio Technology's turntable).

Where do you buy SRA platforms. I emailed the company a couple days ago, but haven’t gotten a response.

Silent Running Audio are swamped with orders.
Try email Tim at silent Running Audio dot com
But be prepared to wait months. Worth it!

Thx.