In response to the question about price to pay over invoice:

Go to edmunds.com and read about incentives etc that lower the vehicles actual cost to the dealer below invoice.

To all the posts on this thread of I payed $2000 etc:
After reading this post why do you continue to bow to demands that the merchant is not authorized to make, and then humiliate yourselves by showing you were outwitted here? A few people have commented that they did as good as they could (no viable alternatives so walking away wasn't an option) but many of you have given no indication. Why aren't you just walking away?