Right after I posted I checked eBay and Amazon.
Just the cheap stuff you mentioned.
And nothing in my size (14EEEE).
I was lucky.
When I went through the Replacement Station I got the only pair of “Extra Wide” they had.
The Supply Sgt told me to take good care of them because the chances of getting another pair in country were pretty close to zero.
Looks like they're out of stock, though, which is not surprising.