Looks like the Nitro Stampede may be going the way of the dinosaur, since it's not listed in the catalog anymore. Too bad because I own two of them. If they do happen to discontinue them, parts shouldn't be a problem. I think you can still get just about any part for every vehicle that Traxxas ever made.
I have a Kyohso Stinger MKII buggy, and I was having trouble getting parts for it only two years after production ceased. I will never buy another Kyosho RC again.