If you can find wheelweights for .25 per pound, and they are not all Fe or Zn, buy them. Soon, you won't be able to find any for less than $1/lb in raw form. I can get you onto sorted, raw weights for $1/lb shipped. That is next best to the smelted and ingotized ones. You can often get the weights in ingot form for close to $1/lb shipped, but not always.
If you buy off of auction sites, be careful. Many sellers there are simply unloading Zn contaminated lead, trying to pass it off as clean. Check feedback on sellers if available.