I used up all the really nice late-1960's wheel-weights gifted to me by a co-worker (who inherited them from her father). Boy, those were great. Obviously had plenty of tin in them and cast beautiful bullets. Didn't even need to be sweetened.
So I went to the scrap yard and found a horrible scene. Their bins of wheelweights were mixed...iron and zinc with the lead. Most of the lead ones were in of the stick on variety. At most 20% of them where lead clip ons. I guess it's just the direction the wheel/tire industry is moving.
Needless to say I am not going to bother picking through that pile of junk. I have better things to do.
Fortunately they had a nice big pile of "dead soft stuff" as they say at this scrap yard. It was lead wire, lead sheets that were about 1 inch thick cut into strips 6" to 1' long (have no idea what this is for). And an a bunch x-ray jacketing (enormous plates of 3/4" lead) and some roof lead. This stuff was being sold for $1/lb, which is a lot more than I paid for lead last time I bought it (35 cent's a pound back in '08). But I didn't want to go home empty handed so I bought some anyway.
Went to another scrap yard and they had a big bin of tin tubing (beer cooler tubing) of various diameters. This is a common thing at Cincinnati scrap yards at least. It is nearly pure tun and "cries" if you bend it. I've never seen it outside of Cincinnati, and I go to scrap yards throughout Indiana and Ohio. Bought plenty of this stuff, though it was expensive at $10/lb.
TIP: bring a kitchen scale with you when you buy tin so you can weight it out before going to their scales. Typically their scale is accurate to the pound, and you don't want to take a bunch of tin and walk up to their scale (after waiting in line) and then find out you picked up $300 of tin or something.
Years ago people transitioned from binary Pb-Sn alloys to quaternary Pb-Sn-Sb-As alloys based on wheel-wights. While these were useful, they are becoming hard to source. In my case at least it is easier to just source pure lead and tin. And the truth is that I can make better bullets from pure lead and tin. Costs a bit more, but worth it to me. If you really need the antimony for hardness (like for rifles) then get Roto's superhard.
Also, as far as cast hollopoints go, binary alloys just perform better. WW based alloys can be made to work well, but I assure you that anything that works in WW will work BETTER in as a binary alloy, mainly due to better weight retention because binary alloys are less brittle and "stickier." Better weight retenetion = better penetration, and penetration is the typical shortcoming of a cast hollowpoint.