A "super-easy" sale? Well, perhaps but shoppers who use your approach rarely buy cars. If a dealer is foolish enough to give them a hard number, they will only shop that number all over town.
I would find out if they have the car in stock, do your research and make them an offer based on your research.
For every "eager buyer" that comes through the internet like you are doing, there will be 100 "strokes". er.....non serious shoppers.
Also, they don't have "copies" of their window stickers.
It's a "can't win" senario for a dealer.