What is the opinion of Reddit about the
WAOAW Seat Cushion for Office Chairs, Sciatica Desk Chair Cushion for Butt Long Sitting, No-Slip Single-Lining Protects?

Gary Platt are the best, but I don’t know how you’d go about getting just one cloth dealer height chair.

You could go with any durable chair and a cushion like this:
https://www.amazon.com/dp/B096FV5DWV

I’ve used them for 14+ hour dealing shifts before and they’re great. The only problem is you have to be sitting in just the right spot to get the full effect.