You can sign up as a Super Supported, which allows you to access Ratefindr (where you can find RV, MF, and rebates/incentives). Or you can ask on the pertinent Edmunds board for free.
The general recommendation is to construct your own offer, based on data that you find here (including the pre-incentive/-rebate selling price, which is the true measure of the dealer discount).
@paranoidgarliclover covered it well. Hardest thing for me to change was shopping methodology, but once I turned the corner it made everything simpler. It’s worth the effort on the learning curve.
Generally if you ask for 100 quotes, 90 will be terrible and the other 10 will be below average.