Sounds like you are asking for a "KICK BACK". tThis is NOT LEGAL
Now if your agent wants to give you a "CREDIT" form theri commission they can, but that is not something you should ask for, it is something they offer.
You can very well go ahead and write an offer for your self, but where will you get the forms?
CAR form are not avail to the publice. You can buy a purchase agreement froma stationary store to submitt your onw offer on but , the Listing agent and the seller may not even entertain such an offer.
Remember there is a lot more to representing you than just "writting up an offer"
The terms and conditions of the offer as well as making sure ALL parties do theier due diligence is something your agent will do for you.
Best Of Luck to YOU,
Kawain Payne, Realtor