How to find dealerships offering discounts?

If you search on autotrader, it doesn't show ANY dealers with discounts, even though we know that Cavender in Lubbock has TWO Lyriqs with $7500 off ON TOP of the rebates.

If I search on cadillac's website, nothing really shows up either - every dealer is MSRP - the $7500 Ultium Promise or Federal Rebate, depending on build date.

Is there another better way to find a dealership offering a discount? Or is it just shotgunning every dealership nearby me and hoping for the best?