In addition to the replies below, a typical sellers commission here in Westchester is 4-6%, which is spilt between the buyers and sellers agents and paid at the closing. As stated below, the percentage is negotiable, but keep in mind you get what you pay for. Compare not only the commissions but what each company/agent has to offer in marketing and selling your home, and what kind of resources and exposure the company can offer.
If you would like more information please feel free to contact me directly.
Lisa K Dollinger
William Raveis Real Estate