The kit version is about $310. RTR is around $400. Link: http://www.axialracing.com/products/ax90020
The kit has softer compound tires and slightly better front axles than the RTR. Vanquish Products makes some of the best scale parts, they’re made right in California. All of the stock kit parts are plastic, so replacing them with metal makes a difference for crawling. The Vanquish tie rods and suspension links are titanium an everything fits like it should. I bought every Vanquish part for the Wraith so I don’t have to screw around later with broken parts, even the axle housings are milled aluminum.
Check some of the RC crawler forums, tons of stuff out there for parts. A lot of guys just make their own parts too.