https://www.dennisdillonchryslerjeepdodge.com/
I caught a Youtuber talking about how he got a quote from them (didn't name them just said "The dealership in Idaho" - it's a known "secret") in writing and shopped it around his local area (Oregon/Washington). He had 3 months to wait for an insurance claim to come through and shopped their quote to 30 dealers. He eventually got one to beat their deal by $1,500 so he didn't buy from them. But yes, that's 30 dealerships and 3 months of haggling and waiting for $1,500. He also still ended up buying out of state and having to deal with all of the out of state tax and registration complications anyway.
Sure, $1,500 is $1,500. So it's possible you can get a better deal. But not significantly better and as
@jmann said most won't even come close. Also, 3 months and dealing with 30 dealerships has a cost associated with it as well. So yeah, Idaho!