I traded my car in and Tesla matched the quote. It was within $1K. If the Tesla's offer is close you may want to trade-in with Tesla for the tax advantage. For example, if your Tesla is $78K and your trade-in is $34K you only get taxed on $44K. If you sell to CARMAX they give you $34K, but you still pay the full tax on $78K for your Tesla. Need to look at the numbers to see if it is worth it for your specific situation.