The majority of my lead is wheel weights. I have one tire shop that gives me their lead. One of the County shops will give me lead and the other is run by a jerk that won't. I think he is selling it on the side. I get pure lead roofing pipe jackets from a roofer buddy (trade him ammo for it). I have made some deals for Linotype in the past. I have used Rotometals for 50/50 bar solder, but yes it is expensive. Tin is very desirable, but not absolutely necessary for many applications. I use pure lead to "stretch" my other materials in lopw velocity applications (.38 and .44-40).
I use a Lyman lubrisizer with heater plate from MidwayUSA and hard lube. It may be a little slower than the Lee TL's, but much cleaner. I just don't like the TL molds. I do not like the designs, they are not "traditional looking". I blend my metals for the application from 20-1 Lead-Tin for muzzle loaders and shotgun slugs to 50/50 wheel weights/Lino for rifles and a few select handgun applications.
I load a lot and save my scrap brass in a bucket. When I have a 5 gallon bucket of brass, I take it to the scrap yard and "trade" it for lead. I take the dross and steel WW clips to the scrap yard and give it to them so it gets disposed of properly.