Wheely chair without a back (Northeast Heights)

Hi! I am looking for a wheelie chair that either has a back that can be removed or no back. Ideally it can be adjusted in height as well. I have an issue that makes standing for long periods of time hard and people in my community say a chair like this in their house helps a lot. My house isn't large so if would be great if the wheels don't have a large spread but also, I'm asking for something for free so I am not doing to be picky off of works! Thank you!!!