They still sell lead core, though it isn't' used as much now that Tungsten lines are available.
Cortland makes LC-13.
Rio makes T-8,11,14,17 and 20 I believe.
Airflo makes T-7, 10, 14 and 18 or something like that.

The best way is to make your own heads. Buy bulk material, cut to length and add loops.
With all the different sink rates, you can pretty much cover anything you'd fish.
SF
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