Free: Contests & Raffles.
Toyo M55s are killer tires for guys that aren't into serious off-roading.
I went through a few sets before finding the ones I am happy with, the Les Schwab Mud Terrain SXT. I would get a flat almost every time I went off road just on forest service roads with the BFG's, it might be because the truck weighs 8000 lbs. but still. With these SXT's I have not had a an issue.
Les Schwab is a bit more but they earn it in customer service.