Where can you get a cello posture chair?

You can find a cello posture chair at music instrument retailers, both online and in physical stores that specialize in orchestral instruments. Websites like Amazon, Sweetwater, and Thomann often have a variety of options. Additionally, visiting local music shops or consulting with a music teacher can provide recommendations for ergonomic chairs designed for cello playing. If you're looking for something specific, checking with specialized instrument manufacturers may also yield good results.