Invoice price is the dealers cost plus holdback. Holdback includes things like advertising costs. Dealers get incentives after the end of the month for the gross number of vehicles that they move during the month. This is why some dealers are willing to sell for under their invoice... They are making up for their loss by getting an allowance from the manufacturer.
BTW... You should stick with the larger dealers for this reason. The more they sell -the more that they
can discount.
Oh yeah, you should be able to get the invoice price from
www.cars.com or
www.kbb.com .