Even if they tell you ....they pick a price to go with the car the person trading in is buying. Then they use it to play games with the "down payment" and such. If someone thinks their car is worth more they will up the amount paid and then up the amount the car they buy costs.
Then there are cars they buy at auction..some are probably sold in lots without an individual price.
Then there are cars they buy at auction..some are probably sold in lots without an individual price.