You can't expect to get reliable, up-to-date, concrete price information without communicating directly with the dealers. Find locations that seem to have inventory available (either on the lot or in transit), then send emails and/or texts and make calls. Repeat. That's the only way. It has to be a continuous process, not a one-time inquiry. You can even get on dealer lists and have them contact you when something comes in, which helps.Not sure how or what to search for since autotrader just lists MSRP price for new cars and you can't see if the dealership marks it up.
My local Kia dealer (the one closest to my home, not the one where I bought my Telluride) lists its limited inventory on its website by MSRP, in ascending order. Here's what the end of the current list looks like: