Sandbags and other weights, including lead/steel ingots — Local places to buy these

Places that claim to sell scrap material.   (Though I first need to check what quantities they sell at. I'm only interested in small quantities.)

• JB Scrap [maps]
• Windy City Recycling — Looks like very large minimum quantities.

Other random places:

• 🔍 Facebook Marketplace
  • scrap lead, for sale

Other random nonspecific places:

• random ideas from Reddit

Industries that use lead weights

Theater rigging counterweights:^[?] Places that look like they might sell them:

• Reed Rigging
• Chicago Flyhouse?
• Places that very likely could refer me to a local place that sells them:
  • Grand Stage
  • Chicago Flyhouse
  • IATSE Local 2 and Local 476

Diving weights:^[?]

• There's 🔍lots of SCUBA stores around.

Boat ballast.^[?] Businesses that look like they service a lot of boats, and may do some amount of scrapping:

• Kendor Marine — I saw multiple [anonymous online] sources saying that Kendor Marine salvages parts from old boats, and offers them for sale. [maps]   [auction listings]
• Bay Marine.