re: Why are there no more army surplus stores?

If I had to guess...

The amount going to surplus following WWII was enormous. What was there like 13 million in uniform at peak? All this material was also obsolete in faster intervals.

Secondly, I think it was easier to buy and wear OD green clothing and equipment than today's camo stuff. The old OD blends in with civilian life a bit more, and you don't look like a separatist, neo nazi, or some other anti social type. Old field khakis look not much different than Bills khakis. I'd feel like a tool wearing modern camo but not being in the military.