Free: Contests & Raffles.
8ply if you can afford to do so. with 4 ply you will be fixing flats at some point.
Les Schwab on 1st is trying to sell me car tires when I have a truck .
This isn't in Yakima but just an example of the kind of deals you can get:http://seattle.craigslist.org/see/pts/3248289876.html
Go to Costco and get some BFG A/T's, *censored* tire and best price in the area.
franks tire in selah is pretty good, kenny is pretty forgiving when working with a budget. Just ask if he has any used ones, at the very least he can usually get some pretty fast. Hes been a family friend for a while and he was able to get me some for less than 150 for my ranger.