What is a great RC Rock Crawler under 100?

You won't find a great RC for under $100. Not new or ready to run. There are a few good rock crawlers out there, but you are not going to find one with that kind of budget. Check out Axial.com. In my opinion they are the best, or one of the best. Check out some youtube videos of the ones you like so you can get a better look of how they run. Hope this helps.