It won't be the end of the world if we don't get one, but my 4 year old did ask for this as his Christmas gift.
My plan is to hit up Mills Fleet Farm (
http://www.fleetfarm.com/mff/) when they open toyland (probably October 17, but haven't seen the official date yet) They always have whatever the hottest toy is that season, you just need to be there when they open the doors that first morning.
I posted the link to help others in the Wisconsin/Minnesota area who may have forgotten Fleet Farm.