The market for used Teslas is heating up. A booming secondhand EV market is pushing used Tesla prices up even as other electric vehicles get cheaper. The average price of a used Tesla has climbed 4.3% since the end of the $7,500 tax credit for new electric vehicles in September, according to data from used car seller iSeeCars. The two used EVs with the largest rise in prices were Tesla's luxury Model S and X vehicles . Musk announced in January that both models would be discontinued in the