If it's the exact car you ordered with everything you wanted then you're in a unique position to get it for a great price. Tell them that if they want to close the sale by end of business tomorrow, then you want it for under invoice. If not then walk and order your car at another dealer. Not unless you put money down for the car you have already ordered and are legally obligated to them. It's the nature of the beast, dealers are "dealing" to get what they want and need. Don't take it personally, you're not the first one
Just try to make it work for you this time. GL