There is no set price. It varys from company to company. Here is a link to my blog that will explaine a little bit why it varys.
http://www.kelloggspainting.com/blog...-Estimate.aspx its like buying meat you can by quality or garbage. You should not focus on price along, as you should focus more on the quality of materials, steps outlined in proposal, contractors reputation, contractors knowledgen contractors professionalism, contractors referances, written warranty from the contractor, make sure the contractor is insured, liscensed, pay sales tax in states where applicable and over all focus on the vakue that the contractor will provide.