First off. Many garages/tire shops already have scrap dealers picking up their weights.
Scrap lead is being sold by scrap dealers right now for typically $0.50/lb. I have no idea what they're paying the scape pickup guys for it, but you can bet it's much less. Don't get all excited about that though. Most of the lead they get in a scrap yard isn't hard enough for casting. If you can find one, buy a Lee lead hardness test kit. You need to use them with a reloading press. It puts a small dent in the lead with a ball on a calibrated spring. You then measure the width of the dent with a small optical microscope that comes with the kit and compare it with a chart that also comes with it.
They will want to sell you scrap wheel weights for the same price as general lead scrap. How are you negotiating skills ?? Tell them you'll give them 25 cents a pound and see where you get. There's zinc weights, iron weights, plastic, steel clips, etc all mixed in there. It's not like it's clean, sorted metal. If they go for it, buy 1000-2000lbs, do a giant smelt one weekend, and you're set for life. I know that sounds like a lot, but 2000 lbs of lead doesn't take up very much room.
Printing press linotype is pretty much a thing of the past. If you can find it, buy all you can because you won't likely find it again. Most of it is long gone. Bearing babbit is casters gold because the antimony content is high enough that you can mix softer lead with it and come out with good stuff. Again, it's pretty rare.