Task chairs should really be made and bought with an eye toward ergonomics. The person who uses a task chair will be sitting in it for hours, and it should have firm support for the lower back. The height and tilt should be able to be adjusted and the seat should fit the shape of the user and should distribute their weight evenly. The seat should be at least one inch wider than the user's hips and thighs. The cushioning should be ample and comfortable and the chair should have a five pedestal base on casters so it can be easy to move. It should also be able to swivel. A task chair should also have cushioned arms.
The OfficeMax Demas task chairs are great for prolonged sitting and make good board room chairs.
There are two kind of office chairs, one is regular office chairs, another one is office task chair, but they are no difference.
Office task chairs are sold at a variety of stores such as office supply stores like staples.com. Lowe's is a hardware type store and does not sell office task chairs.
The best locations to find good quality computer task chairs would be through a reputable company like Office Max or Office Depot. Another place to find good quality computer task chairs for the cheapest prices would be to use compare and auction sites like EBay or Amazon.
Target has these chairs in the store and online. And the selection is fair. There is also EverythingOfficeFurniture.com, which has a large variety of all different chairs including Task office chairs.
There are numerous companies that sell ergonomic task chairs to help with posture. Amazon is a great online option as well as stores such as Office Depot and Sit Better.
If I was looking for task chairs without arms, I would look at home depot, lowes, office max or walmart. Sometimes I go to Target, but there is not one as close by.
Mesh task chairs can often times be more orthopedic than similarly priced alternatives. They also tend to breathe better than leather or fabric chairs.
Task chairs are usually found on specialty chair websites. You could also try office supply stores online such as Office Depot and Staples, as they sometimes sell them as well.
Staples does sell ergonomic office chairs however their range is not that large. These chairs are available at similar prices, and sometimes cheaper, from stores such as office depot.
From the research there are a few that stand out. Staples brand gets high marks, as do chairs from companies Global and Office Star.
You can buy one at office depot. A list of chairs can be found here. http://www.officedepot.com/a/browse/ergonomic-and-task-chairs/N=5+501511/ They are great chairs for any office.