Edmunds is not a good place to find information. I happen to know first hand that their info regarding pricing is not always spot on. I have found that COSTCOAUTO.Com is exactly spot on for finding pricing. Plus if you can find an honest dealer, and yes they exist, you can ask to see the invoice and they should show you. If they dont or wont then you should do business elsewhere. Good Luck
You might try truecar.com. It will list not only invoice but actual dealer costs. You can put in your zipcode, and it will give you local, regional, or national numbers. Not sure if that will get you what you're after, but you might have a look...