Most dealerships don't give a ****. I did the same thing before I ordered my 22 with mark dodge 3 weeks ago. I Sent my build to like 10 dealers in Florida, a few wouldn't even discuss price unless I came in, a few never responded and the others said MSRP and that was it. Dealers will make money whether you buy from them or not. You will never find the same deal across the board.
It takes patience and gamesmanship but they will deal.
I found 2 dealers that would deal from the start and had no problem competing in writing and I was completely open about what I was doing, I got great numbers comparatively.
Then a dealer who was unwilling to deal the first round "checked in" and I told him I found 2 dealers that would deal and in 30 seconds they changed their story and beat the deal I got with a price guarantee.
To be fair I've bought 2 other Jeeps/Rams from them and buy every 2 or 3 years, so they know if I'm calling I'm buying.
All in all out of 6, 2 dealers would deal off the bat, 2 didn't but changed their minds after a week and 2 didn't even respond.
In guess the bottom line is with a lil work I went from $67000ish and $2500 in trade equity or $64,500 to $56000 ish out the door.
The price lock is based on the incentives at the time of purchase unless they're better when you pick it up.