avg discount from list

I am new to this board but have been checking it for the last week or two, and need some advice. I am going to buy a new Moomba this week. The boat shows are going on this month and I know that is the time to buy (I see you can choose 4 free options ).
What I am not comfortable with is the local dealer is not discounting his boats from list, he says there is not really any mark up on an out back and the pretty much get list for them. I would like to buy from the local dealer but need a guide as to how much of a discount I could get elsewhere. and maybee I can use that as a negoitating tool.
I would also like some opinion about the upgrade to EFI, I think it would be a smart move, any suggestions.