At home I have the bungee office chair from the container store and love it! You can can find a coupon on line and it has free shipping.
For my Monday Sewing group I take a special cushion to put on the folding chair. It raises me to the correct height and is softer. It takes a bit to get use to the balance but after a few minutes it's great!
https://www.amazon.com/Dyna-Disc-Bal.../dp/B00077E32C