I always walk-in to Carmax with my 'trade-in' car, about 30 mins later I walk out with a written quote for my trade-in good for 7 days. I then walk in to the new car dealer, hand them the quote in writing, ask them to match it and we usually have a deal. Only once have they not (and the difference was significant from Carmax) - so bought my new car, drove the old car to Car Max, sold it to Carmax with the quote 20 mins later, Uber'd back to my new car, drove home. Easy as pie.On your trade - you could see whether CarMax or thru TrueCar buy offers are inline with what the dealership offered if you have the time.