This incredible shield, made by combining an Electrical Harness and a Quality Ironshield, not only protects you from physical attacks, but also interferes with spells thrown at it!
In the scene where Pepper discovers Tony removing the damaged Iron Man armor, you can clearly see Captain America's shield partially constructed on a workbench.
To shield themselves from higher raw-material prices, more of them are acquiring their own iron-ore and coal mines or deposits, as well as producers of scrap steel.