Computer Chair – Back Pain Fix!

So recently I’ve been having a lot of back pain, and i know its 100% because of my posture and computer chair.

Since most of us sit on the computer all day as well i figured someone found a solution to this. What do you do to keep your posture and back in check?

Any recommendations on the best computer chairs? I know theres some crazy 1k+ ones but my price range is more like $100-$250

Would really appreciate some responses. Thanks

** Miss spelled title – its suppose to be Computer Chair*