Not sure about everywhere else, but we still have military surplus outlets in Michigan, and indeed they do sell some of the stuff you mention. A lot of the inventory is new stuff too, and I’m sure a lot of the stock is replicas rather than authentic. I assume the uniforms are real though, since much of it is used, and you can see where patches were removed.
We used to have a ton of them in NYC, but they went the way of the dodo.
I wonder how many municipalities are spending Homeland Security grants to buy generators and othe heavy equipment while we leave them in the sand box.