When buying cheap office chairs, there are several factors that you should consider.
The first is comfort. Depending on the amount of use you expect from the chair, you may or may not care about design or comfort. However, if it is an office chair that will be used on a daily basis, there needs to be some thought given to the users. An uncomfortable chair can, over time, cause serious issues like back and neck strain, and arm pain. And, unfortunately, comfort and cost track together; the greater the comfort, the higher the cost.
You have many options when it comes to cheap office chairs. There are leather, wood, cloth and even plastic models available. Again, comfort becomes an issue, with leather and cloth models being much more comfortable than the harder models. If the chairs are being used more than for short meetings, casters (wheels) on the chairs are essential. You should also make it a given that the height of the chair needs to be adjusted. People of differing heights who are using a keyboard will need to be able to adjust the height so that their arms do not become fatigued.
You may consider buying used chairs, if you are looking for only one or, at most, a few chairs for your office. However the availability of good deals is hit or miss.
When you buy new, remember to build in shipping costs to your budget. Chairs are neither small nor light-weight. Also, find out whether or not there is any assembly required, and make your plans accordingly.
In general, expect to pay anywhere from $80 to $700 per chair. Even the most basic office chairs are at minimum $80, if you get one with height adjustment and wheels. Of course, a chair that cheap will be of lesser quality, offer less support, and be overall less comfortable. Executive chairs (usually leather) can easily exceed $1000.
If you consider these factors when shopping for cheap office chairs, you should be able to find a good deal on a model that meets your needs.
Christy - Stacking Office Chairs info from http://stackingofficechairs.net