Special vehicles in GTA 5 can be found in a variety of places, including:Missions:Some missions require you to use a special vehicle. For example, the mission "The Los Santos Connection" requires you to use a Phantom Wedge to hijack a drug shipment.Events: Some events, such as the Import/Export Special Vehicle Work, reward you with special vehicles for completing them.The Vehicle Warehouse:You can purchase special vehicles from the Vehicle Warehouse in GTA Online.The Podium Vehicle: The Podium Vehicle in the casino can be a special vehicle.The Street:Some special vehicles can be found randomly on the street. However, these vehicles are rare and difficult to find.
If you are looking for a specific special vehicle, you can use the internet to find a guide that shows you where to find it. You can also ask other players in GTA Online if they know where to find a specific special vehicle.

Here is a list of all the special vehicles in GTA 5:Land Vehicles:    * Blazer Aqua    * Brute Armored Boxville    * Maibatsu Mule Custom    * Phantom Wedge    * Pounder Custom    * Ramp Buggy    * Rocket Voltic    * Ruiner 2000    * Speedo CustomAir Vehicles:    * Cargobob    * Frogger    * Havok    * Mallard    * Nimbus    * Stunt PlaneWater Vehicles:    * Kraken    * Seashark* Stromberg