The lead wheel weights are going away. Period.
There are many places to find lead in ginormous quantities...but those are few and far between.
I think of looking for lead as a journey. It takes times to do it cheaply, but for folks with a bunch of $...it can be done immediately.
I've met several folks that have "inherited" a lifetime supply of lead, from someone that had acquired it. Many times it's a legacy thing. If you're serious about helping save lead for the future, sooner or later you will find someone with a bunch of lead that will entrust you as the "keeper of the tradition".
And most of the tire shop folks I've met, are good people that would rather make a friend's day (by giving us a bucket full), rather than sell it for $30-$50.
And some folks just sell it outright.
As for myself, it's a cool hobby to seek lead in small or large quantities. It is a focus hobby, which takes our mind off of our daily problems.
-Butchman