Budget Herman Miller Aeron ($200-300) Recommendations?

Hello Everyone, I am looking for Herman Miller Aeron alternatives for around $200-300 USD. I heard the aerons are good for maintaining proper body postures, however it is too expensive for a broke college student like me. Unfortunately, I couldn't find any used office cheair deals near my area, so I decided to ask this community for the next best option.

I would appreciate any recommendations. I priortize on ergonomics more than anything else.

Thank you!

P.S. I saw some chairs from Staples that look similar to the aerons. Are they comfortable even after a long sitting session? Thanks!