Most dealers won't accept TruCar relationships for that very reason, and any salesman who matches their pricing is going to be out of a job unless he makes the lost profit and costs back on the trade. The opinions given above who suggest otherwise don't know the industry. CarMax is also notorious for lowballing trade-in values and only beat dealers by a small amount statistically. (When between labs I stay busy with a seller's license, I'm GMC and Ford Certified.) If you need to buy a vehicle, get your advice from Consumer Reports. Getting it from where you are reading this right now is not the place.