I got a quote from Tesla for my car that seemed a bit low so I marked "no trade" on my order page and figured that I'd just sell it to Carmax instead. But now I'm seeing people report that if you go to Carmax that Tesla will match the price. Doing a real trade in has some tax benefits so I'd rather just give it to Tesla if they're going to match Carmax anyway. But I don't see any way to change the trade stuff on my order. Is it possible to change your mind and do a trade after you already said you weren't going to do a trade?