It wasn't part of your list but we had a good experience at South Hills Subaru in January 2022. I had emailed a sales rep about a Forester coming in in a few weeks. I didn't negotiate and paid MSRP with them matching the carvana offer for our trade in. We showed up at the dealer and were out within 45 minutes with our new car. I wish all car buying could be that easy.

Two possibilities to get under MSRP without haggling:

1. Costco auto program if you are a Costco member
2. If you donate over $500 to ASPCA you can join the Subaru VIP program which gives you 2% under invoice if I recall correctly. However, not all dealers are participating currently. It's best to call and ask if they are participating in the VIP discount program first