Around these parts, you can get set up with a workable plow for about $3000. You could theoretically make that back in one season as long as no unexpected repairs are necessary. It's going to be a heap, of course, but plowing will ruin a nice truck in a hurry.
I can't believe you don't have a snowblower. I got mine for $50 and it lasted two years without a problem. It's on the large end of the scale... I'm hoping I can fix it for cheap.