Due to federal anti trust laws Realtors really can't (and shouldn't) discuss specific commissions, as that can be seen as an attempt at price fixiing - even if that wasn't the intent.
Legally, there is no "customary, standard, usual or typical" commission!!!
It's good to see that most of the agents here "get it" and know the law!
Those that don't, better read up on it!
So - the only legal response is.....ALL commissions are negotiable.
Speak with several local agents and you will see what their commission structure is............ask for a written marketing plan so you will know what to expect, and you can compare and contrast what is being offered.
And, truthfully - sometimes you get what you pay for, and sometimes you do not.
Just because someone may charge you more than someone else, doesn't guarantee top notch service, so you have to do your due dilligence.
If possible, look for an agent who comes recommended, with whom you feel a sense of confidence and who has a winning track record in your area with getting their listings sold.