Used to comb the fields between Okotoks and the 49th parallel for them, but got run off by too many farm dogs. Every truck I ever actually bought (although I found tons of them by simply bird hunting/driving around gravel roads) was from the newspaper or word of mouth,except one.
My favourite one, a '40 half ton I should have NEVER sold, was from an estate auction sale. Best ones to go to are mid-week ones, ones on weekends there are too many rich guys buying antiques for their cabin there.