I haven’t sold any of my audio gear in 10 years so I’m not up on where I may find interest in an expensive active vibration platform (and I’m not a huge fan of A’gon). I have several of these units and about to place 2 under my BHK300 amps. These have made great benefits to my turntables and I’m excited to try them under other electronics.
as shipping for heavy platforms like that is a big deal, the first bit of information you need to share is where exactly are you. there may be someone close who could avoid shipping, and maybe even inspect them personally.
i have 5 Herzan TS active platforms, that are all Taiko Tana modified with LPS's. so i do respect what these can potentially do for the performance.
this forum could be a good place, or maybe Audioshark......or even Audioasylum. WBF will cost you, Audioshark requires a bit of posting history, and Audioasyum is really for low level gear. then there is always US Audio Mart......maybe the overall best spot.