Don’t get a chair with cheap foam like that. Get one that uses mesh instead. More breathable, and it’ll last way longer. Ikea may have some. The Staples Hyken is pretty decent for the price, if you get it on sale (<$150).
The Herman Miller Aeron chair is still the best, but it’s very expensive. You might be able to get a good deal at a store that sells ex-office furniture, but a “good deal” for the Aeron is still $500-600. I think there’s some Amazon stores that sell them second hand. If you buy one new, they have a 15 year warranty that covers practically everything. My employer had a pretty big discount on new new ones for home use, from the supplier they use for the office.