I see I am a little late in posting a response here. However, 1stTimer you have hit a sensitive issue with alot of agents-commission!
There are agents who do offer a rebate on their commission who do provide excellent full service to their clients. On the other hand, there are other "discount agents" who provide less service and rebate back money to you. And there are full service agents who do not provide a rebate, but provide their services which could far exceed those of a rebate back to you.
Ultimately, it comes down to how comfortable you are with your home search. If your an internet savvy client, you may be able to do most of your home search on your own, perhaps a discount agent is best for you. If you need assistance along the whole process, perhaps a full service agent is what you need. It comes down to the service you want as a client.
With all that in mind, you should check the Trulia Pros section and there you will see a number of great agents and brokers who you can contact and ask about their commission structure. You have the absolute right to ask for a rebate. Some agents will absolutely not do it. Some will. Ask them what their services will be and see if that over rides your rebate desire. If not, then move on.
Good luck with your home search. If you have not purchased a home yet and are still in the process, feel free to contact me. I am a local broker in Hercules who does offer a rebate.