Bald on the Inside

That's right, three of my truck tires are wearing badly on the inside. The tread everywhere else is fine. At one point both of the front bearings had gone bad, so driving under those circumstances didn't do the tires any good, but who know what that sound was? Now I'm told it is probably the alignment and the tires will be no good soon. Wonderful. I can only imagine how much tires cost nowadays. I haven't confirmed that inside wear is definitely a bad alignment issue so feel free to chime in here folks with your thoughts.