Well, I guess they're less popular outside the Bay Area. I actually managed to find some:

It's not too bad for 89 cents. Looks like they tried to get a few of the interior details, though rather clumsily. Really a shame they didn't try to capture the likeness of the wheels since it's such a distinguishing feature. I suppose, however, that the wheels are one of the few pieces Mattel can share with many other model cars to keep costs down.