I have a Herman Miller Aeron that works great, bought at a reasonable price off Craigslist. Along with the Aeron I often use an inflatable cushion, the "Gymnic

I have a Herman Miller Aeron that works great, bought at a reasonable price off Craigslist. Along with the Aeron I often use an inflatable cushion, the "Gymnic Disc 'o' Sit". Sitting on it keeps me alert and greatly improves my sitting posture.