If anyone is still looking for one of these cars, check out Hiawatha Hobbies in Pewaukee, WI. 262-544-4131. They has a couple left but you will have to call them, I didn't see them on the website.
I wish there were more hobby shops like this one around, focus is on trains, but carries a little bit of everything. They even have one of the Carrera NASA Superbirds in stock.
Happy Hunting