you can always go back and deal some more to get it closer. when I bought my tt, they had a invoice for 28K I got it for 12K plus a 10K trade in and they were screaming how little they were making. after I got it home I discovered they screwed up and left the customs form in the trailer with a declared value of 14K. so the mark up here is 100%
also if they said it was a lost leader that is usually a model they blow out at a low price but they hope you'll see something different you want instead of it, that doesn't mean you can't get it at the price it is advertised for other wise it is false advertising.
Steve