All commission are negotiable.
That being said, interview many agents. From big firms to boutiques, agents are different.
But, don't be swayed by fancy brochures. Selling your home is about fantastic information about your home in the form of excellent pictures and a real video.
Also, make sure that the listing agent only works for you. The listing agent should not be the one who also represents the buyer. This is called dual agency.
If the agents you interview don't mention it, kick them to the curb!