I was at Turner's in Pasadena the other day. Any stuff that uses mostly copper, tin, zinc and lead is almost sold out. Part of the issue is this hoarding due to the Sandy Hook atrocity, but a lot is really due to China's modernization; they need these metals for electrification and are willing to pay what it takes to get them.
But there was some 12 gauge ammo with soft iron shot, #7, for only about $10.00 a box so I got two boxes for a soon-to-be fun trip in the Mojave Desert. This stuff is made almost totally from iron, plastic, and the bases are aluminum. The Chinese are not running short of those materials yet.