Can‘t purchase Saleen S5S or any other cars unlocked in fortune island expansion.

I accidentally removed my Saleen S5S. Before that when I looked at it in my garage the price tag on it says free. But I couldn’t find any place to purchase one.
And in previous horizon games you could buy those expansion-unlocked cars in autoshow. So I’m asssuming it’s a glitch somehow. If so, please help fix. Thank you.

I doubt you can buy it again from the autoshow or auction house as you win it from one of the treasure chests, making it a ‘unicorn’ car.

Thanks. It would be sad if this is true. But judging from previous expansions, these cars shouldn’t be unicorn cars.
Hopefully it’s just a glitch. I’ll just keep my fingers crossed.