Axial has kits, RTR's, and ARTR's. Losi has a Mini Rock Crawler and even Duratrax has one. Then there are the custom crawlers...
Oh, and Traxxas is coming out with the Summit. Two speeds, one for crawling and one for speed runs, plus remote locking diffs. There is a whole world out there beyond the Clod. I couldn't begin to list all the options.