Cars unlocked through progression

First of all id like to say i really enjoy the new horizon life set-up, working our way up through the ranks of each individual activity and unlocking cars/horns/clothes etc as we go, however this brings me to the issue i have.
Just for example the, the lambo huracan. Now you unlock this early on in the light blue races (cant remeber exact name off my head) but once its unlocked its like a one time car. Unless of course you use the auction house theres no other way to get another one until you get to prestige stage and it all resets.
Im totally for locking cars behind challenges as it gives us things to work towards rather than just handing us a map and races and saying here you go.
I just think once weve unlocked the car it should become available in the autoshow, as id like more than 1-2 huracans for different set-ups without paying some auction house prices.
Yes i can see the other side of the coin, as it encourages you to use the auction house, i just think we should have the option to buy numerous once unlocked.

You can just switch tuning set ups.