There are a number of services that will provide you with all this information. I have used some of the following:
One approach you can use is to email the Internet sales at nearby dealers (as many as you can), asking for a quote on a specific model of car with specific option packages. Wait until you are ready to buy, and let them know that you will be buying from the dealer with the most competitive quote within the week. I recommend that you first walk around some of their lots to see what option packages the dealers are ordering. Otherwise you risk asking for a quote on something they don't have in stock, and that will add confusion to the process.
Once you get the quotes back, compare it with information you got from the sites that I mentioned above. In my case, every time I have done this I got very good pricing. You can also go into the dealer and negotiate directly. There are many dealers out there now that don't mess around and have more honest, direct pricing. However, I still like to use my email technique to get a range of quotes. In fact, I purchased my Ford F-150 using this approach about 6 months ago - worked great.
I have been told by car sellers you round-robin several local car dealers to get THEM to lower the prices by matching or beating the others - on the same vehicle specs or as close as you can get as they may not have identical inventory.
Makes sense to me. The car salesman who told me that thought so.
And by the way, when someone takes that amount of time to type up a reply to your question, it’s customary to say “thank you”.