[argonaut]

1. Service centers. Others comments have talked about this.

2. Trade-ins. Most new car dealers also sell used cars (in fact many make more profit on used cars than with new cars). Because of this they can usually give you much better trade-in valuations than Tesla, which I believe just sends cars to auction. Obviously you could also just sell to CarMax/Carvana/etc. or sometimes sell a car to a dealership without buying a car. But this is an added bit of hassle.

[SoftTalker]

The worst price you will get for a used car is trading it in. The best thing to do is sell it privately, after researching what it is worth.