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.
A computer task chair is not your typical office chair. It is a chair that is specially desinged to allow a person to sit at the computer comfortably for long periods of time with less fatigue than a standard office chair.
It is a chair that's convenient for people who work in an office. It allows the person to move around and do multiple tasks.
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.
There are two kind of office chairs, one is regular office chairs, another one is office task chair, but they are no difference.
The most likely place to purchase replacement office chair parts would be from the manufacture of the office chair. If you are unable to contact the office chair manufacture you could always buy a new chair.
I think that places such as Walmart, Staples, Office Depot, etc would carry them. Any store that sells office decor, should have office chairs readily available.
Best office chair for buying in bulk would be the smaller task office chair. They may not offer as much comfort, but would be affordable for buying in bulk.
You can add a pillow of any sort on the seat of your chair for extra cushioning. This probably will add a little more comfort or you can simply buy a new office chair if you're unsatisfied with your office chair.
There are many online shops that sell office chair parts. Bestbuy.com is one of online shop that sells office chair parts with any kind of models. You can visit www.bestbuy.com.
you can buy office chairs that support bad backs at office depot, amazon,or fryes electronics. you should generally go with a chair with a backing that will support the figure of the spine
Office chair mats can be sold at any retail office supply store like Office Max or Office Depot. Another location if buying online is Amazon, which offers used and new chair mats for a reasonable price.
Office stores will make you think you need to have an expensive executive chair for the best level of comfort, but some computer task chairs are actually designed with an eye toward ergonomics and features.