The Alera Elusion and WorkPro 9000 are the best Herman Miller alternatives. These aren’t knock-off chairs, but similar mesh office chairs with some types of ergonomics at an affordable price. Ikea also makes a high back mesh chair. Their Markus office chair is a very valuable alternative.
Gaming standing up is still taboo for many gamers. It’s difficult to adjust to and many gamers feel they lose out on gameplay experience. Others believe they should only game while seated because all tournaments are seated and it would be difficult to readjust from everyday standing while gaming.
The WorkProQuantum 9000 is a mesh-based Herman Miller Aeron alternative office chair. Both are made for long days of sitting (typically 8 hours). For those working up to 6 hours per day, The WorkPro Quantum 1200 office chair can be a more suitable alternative.