Which chair has the best/none lumbar support in the 200 euros/dollars range?

Hi, I own a Proto Arc EC200. The lumbar support is absolute trash, I'm using the chair since more than a week and my back is killing me. I have tried any possible setting besides the fact that I also experience knees discomfort even having 2 fingers space. I wanted to ask about other chairs in this price range. I'm looking at the HOLLUDLE V Shape and normal Holludle grey mesh but I also saw the Sihoo M102C. What do you think about these and what other suggestions do you have? counting the fact that I also have a bit of knees pain. I'm trying to decide if to rip off the lumbar pillow in my current chair if others are worse. My height for reference is around 1.68cm. Thanks.

No used chairs, they aren't available in my area.