My computer chair does not support me.

[Reve]

We changed four chairs in 7 months. The padding on one was wearing out, the legs on another were breaking, and the mechanism on a third was malfunctioning. I don't know what to do anymore. Someone seeing it might think I weigh 100 kilos, but I actually weigh 72 kilos. Anyway, does anyone have a recommendation for a nice chair that is affordable, comfortable, and won't cause any pain when sitting?