My chevy dealer was pretty firm on their trade-in price. I told them what I was offered and even offered it to them at less than what I was offered on FB just to get it all done at once. They declined but were respectful about it, showed me their market comparison report, and ultimately were not upset with me for selling elsewhere. They understood. There are some large used car dealers in my area that just want some cars on their lot.
Carmax & Carvana also offered me much less than anyone else. I did the KBB instant cash offer as well and it came back as the low trade-in and then you have to take it to the dealer. On FB marketplace, I had dealers that would send people to pick up the vehicle and some that wanted you to bring it in. I ultimately sold to a dealer that sent people to pick it up and it was also the highest price. Maybe I could have gotten more by taking it to a local dealer, but I doubt it. Other than the "is this still available" crowd on FB, it was a painless transaction.
Carmax & Carvana also offered me much less than anyone else. I did the KBB instant cash offer as well and it came back as the low trade-in and then you have to take it to the dealer. On FB marketplace, I had dealers that would send people to pick up the vehicle and some that wanted you to bring it in. I ultimately sold to a dealer that sent people to pick it up and it was also the highest price. Maybe I could have gotten more by taking it to a local dealer, but I doubt it. Other than the "is this still available" crowd on FB, it was a painless transaction.