Board Thread:Game Discussion/@comment-37667252-20190704040437/@comment-28169398-20190704045411

It was a gimmick... It meant that you could only buy the car at limited times... in other words, it wasn't always offered even if you unlocked it.

"You may have noticed several limited edition vehicles in-game. This means that they will only be available for purchase at a certain time in the day. The timer is scheduled to ensure that everybody around the world will eventually have a chance to purchase them at a convenient time of the day, no matter what region you are in."

- FireMonkeys FAQ

Full details are available at the FireMonkeys' website.