Same thing here. Wally world, two of them, have very little. Gander Mtn has basically no inexpensive, bulk ammo on the shelves but reasonable supply of small quantity ammo and more expensive ammo.
Herb Philipsons has no Winchester 333 in stock but say it is coming soon.
I no longer shop at or go into Dick's, personal boycott.
I do have a mom/pop shop...VanTassells...just a few miles away and they have a decent supply, especially of the harder to find and more specialized competition ammo.
I suspect the shortages are due to everyone stocking up due to the ban hysteria, stores waiting on normal shipments and not expecting the rush to buy guns and ammo, holiday time off and closings at suppliers/manufacturers, etc. then trying to take care of their regular buyers and getting orders shipped to them.
I'd expect that shipments will start arriving fairly soon after the first of the year. I hope that prices don't jump up too much but will be watchful.
I will be buying bulk ammo throughout the winter. I do think, even if just from a cost effective mode, that prices will rise and there may be shortages until things cool down.