The Black Dodge Challenger is given to the player after they complete the "Racing Pro" Pursuit .
The Orange Dodge Challenger can be bought at the "Hidden Vendor" north-west of the Muir Processing Plant.
The Red Dodge Challenger was a pre-order special.
All other Dodge Challenger colors must be bought as Special Offers at non-faction supplies vendors across the map.
Update: Dodge Challenger Colors; Bright White, Metallic Billet(Silver), & Plum Crazy (Purple) are now accessible to buy from a Special Vendor that only resides in Muir Processing Plant & Shondu's Consulate. The Prices are the same for all which is: 14,500 Scrip and 100 Paradise Rep. (Weekend of May 3–5 Only).