I have been looking into buying a used Model X CPO from tesla.com for a few months now. Waiting for the right color at the right price. I found out today that one can purchase a Tesla directly from the previous owner or from other re-sellers(dealers) like cars.com or facebook marketplace or at onlyusedtesla.com. And then purchase an extended warranty from Tesla, the 4 year warranty costs around $6000. Essentially this will become equivalent to the CPO(certified Pre-owned) bought from tesla.com. Is this true ? Any thoughts advice from the experienced folks out here ??