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It still spawns once and a while if you drive a similair car. You can also get one by entering the cheat code which still dose work in the downloadable content.

The cheat code is activated by dialing (227)-555-0175 on the cell phone. This cheat code does not affect saved games.

Besides that, you use them in Triathlons and you keep them when you finish. They are also in some missions.