Now for $8!
Rune's Low Poly Cars Pack 1 is a set of 5 colorable low-poly models of cars.
Fully compatible with Unity 5
Watch video demonstration
Official forum thread
The pack includes 5 high qualitative low-poly car models (approximately 300-500 triangles per a model), simple colliders, texture maps (diffuse, specular and color, resolution is 1024x1024), special shader, a cubemap for reflections and all materials and prefabs. You don't need to do something by yourself - everything is already done by us.
IMPORTANT ABOUT THE SHADER:
The shader gives the possibilities to change reflection intensity on glass and metal separately, edit force of specular and recolor the cars using a special texture named color map.