I did a little more research last night. The main resin kit is made by Planet X and runs a cool US$ 120 ! (They also make kits of the two multi-colored Pursuit/Interceptor cars from the beginning of the movie, also for $120 each).
So, unless I win the lottery between now and next week, it looks like I'll be trying to track down the Aoshima kit. It's out of production, but I've seen it for sale in a couple of places so I think it's still generally available.
Let me know if you find anything else.