I spent most of Wednesday afternoon/evening finishing (well, starting and finishing) my Christmas shopping. A Cabela's, Bass Pro, Field and Stream, 3 different Wal-Mart stores, and a couple mom n pop places. 2 different malls as well, but not relevant to the OP.
12ga bird shot plentiful.
12ga buck available in some spots.
28 ga aplenty and even 16ga bird shot on a few shelves.
Zero .410 or 20ga ammo and not a deer slug of any kind, anywhere.
The places that sell components all had some powder, but not much. Very few projectiles and not a primer of any kind to be found.
But yes, there was 12ga stuff around and at "normal" prices.