Early on, Mattel found out that one way to get people excited about their model cars-specifically, the model car collectors out there-was to release a small batch of some of their most popular models in limited-edition colors. That's what they did with the super-popular Olds 442. Most of the '71 Olds 442 cars they released were magenta. But, a select few were also salmon, hot pink, and purple and quickly became collector's items. Today, the purple one can sell for up to $5,000.