I gave up looking for wheel weights 3 years ago, I only had two shops left. One shop closed, the other sold. I lost my connection at the sold one. Well fast forward, the owner of the "sold" shop contacted me, via Facebook, that her husband had opend a new shop and had a bucket for me. It came out at 100 lbs. So here is the composition of the new bucket:
Iron (Fe) 40%
Clip on (Pb) 30%
Stick on (Pb) 20%
Zinc (Zn) 9%
Trash 1%
Not the greatest but free.