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It is important that you maintain a good and ergonomically correct posture. A chair is simply a tool to help you do that. If you are average sized or close to average size, it is possible that you can find a cheaper chair which works for you. The advantage of ergonomic office chairs is that they tend to have enough adjustments for a wide range of body sizes. On the flip side, an expensive office chair is not going to solve anything unless you take the time to adjust it properly.