The easiest way is to walk into, or email a dealer and ask a price for exactly what you are looking to buy at the x-plan price. It's easy to deal with them if you have access to x or a plan because they have nothing to gain from haggling.
I worked in new car sales for a while too but couldn't take the constant dishonesty. I'm so glad I'm able to get A plan pricing. I get that it's a job, but it's pretty much the most grimy job outside of politics.