By B15m1lah. Chair. At Saturday, July 14th 2018, 23:15:13 PM.
Fleshing this out further, let's say a company advertises free shipping on their church chairs once a certain quantity of chairs are purchased to select geographical regions of the country. One of their chairs they sell for essentially $33.00 each, once there are a minimum of 100 chairs, purchased as a part of the order and also include "free shipping" for those chairs to about 20 different states. In this case they may purchase those chairs from a Chinese factory for about $13.00 a chair. They bring them to this country, warehouse them, sell them, and then deliver them. Their costs for all of these items is perhaps another $13.00 or so per chair. They then sell them for $33.00 a chair and all of their costs are covered and they make a nice profit. All through the process though they continue to state they are offering "free shipping".
The last factor to consider is how adjustable you will need your ultimate ergonomic chair to be. If you work for more 8 or more hours a day, you will likely need a highly adjustable chair that allows you to recline throughout the day with tilt lock and tilt tension control(allows the user to choose the amount of tension needed to recline back in their chair and to lock their chair in the upright position when typing then unlock when recline is desired). If you are a taller or shorter individual, it may be beneficial to have a seat slider adjustment that allows you to determine make your chair's seat depth either longer or shorter.
If you experience neck pain look for a chair that comes with an adjustable headrest. Again you will need to measure your back to ensure you do not pick a chair that has a back that is too high or too low, otherwise your headrest may end up turning out to be detrimental rather than helpful. Many people suffer from lower back pain from having a chair that does not have proper lumbar support which is why it is crucial to find a chair that offers built-in lumbar support, adjustable lumbar support, or air lumbar support to prevent lower back pain.