In the years following World War II, there was a huge amount of military surplus sold through small, generally independent, retailers. Some was in good shape, and the careful shopper could find bargains.

Recently, most of the merchandise is rather poor quality. Usable military surplus is rather hard to find (at least that is my perception).

I have scored some great deals over the years. Mil surp bearpaw snowshoes for $7.50 - in great shape and ready for the trails. I still use a US Army Mountain Cookset, 1951, that is lightweight and durable. Paid less than $5 for it sometime around 1960.

If you like to bargain hunt, you will love surplus stores. But caveat emptor! You are likely to find better stuff at your local "goodwill" store these days (IMO)