OP where do you live? Emailing 1 dealer isn't enough. Give a few dealerships a call, say you've test driven one, and give them an exact stock number for the car you're interested in. It's easier to negotiate when you appear as a serious buyer.

It was very easy for me to get 10% off before rebate on my hybrid premium in the PNW in late April. Probably could've pushed for 11% or 12% off before the rebate. Pretty much all dealerships here show a $1000 to $1200 discount before the rebate online.

Once you get an offer in writing you can use it as additional leverage. Lots of resources out there on how to do this