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When I bought my model 3 they told me they would match Carmax, however Carmax and Tesla had matching prices so I just traded in. I don’t know about Carvana.
Did you take them up on it? Up until this week when Carvana upped their offer Vroom had them beat by $100 or so, but the process sounded tedious so I think I would have done Carvana anyway. They came to my house with a check and we were done in 5 minutes, which was really painless.