I owned it before, it's cheap, simple, no shock at front. If I were you, I will choice Hotshot or Frog. They are better than grasshopper a lot. Grasshopper feel like a tt01, down to earth! Please correct me, if I wrong.
Parts are easily available on ebay. Options parts from other manufacturers are not available any more. But u may find some vintage parts on ebay.
If u plan to play the car for a long time, the most economic way is to buy another kit as parts since grasshopper costs only ~$500. The price of buying parts separatelly (e.g. body, tires, arms, chassis,... etc.) will add up quickly and cost much more than that.