the cheapest ways have been mentioned; however like Drone stated, once you go bigger than 33, the cheapest is not cheap if you really want to use it. 35s on a samurai takes starts a chain of upgrades thatyou wouldn't need to do on 33s. Not talking you out of it, but the title of cheap and 35s don't go together. I would have 35s but with the travel that I currently have the tires would rub the fenders so bad that I was breaking axles and lockers. so not wanting to re-engineer the complete suspension, I went back to the 33 swampers. I even cut and raised my fenders and my front pass tire was hitting my battery area of my fender.