I got my 2.5S A/C, blond int, with sunroof, convenience package and kick plates for $24,312 out the door. This was back in August of 07 and according to Edmunds.com, I got it at invoice price. I had to drive 100 miles to get it though, since no in the Atlanta area wanted to give it to me at that price. Read up at
http://www.carbuyingtips.com/ they have some good pointers and the spreadsheet they have is pretty good, just plug in the numbers and it will tell you the final cost and how much a month your car note will be.