Doubtful. You'll find reproductions, but any of the originals are now almost 80 years old. Actual surplus is rare since the military doesn't operate like it did 40 years ago, and since time is not kind to cotton and wool, World War II surplus are especially rare.
I've seen a few old school USMC patches so I'm sure there will be uniforms. Make sure to call and ask first, they might be able to grab some from the warehouse.
Not sure, they have a lot of old stuff. Just call the guys that work there are easy going and will help you out.
I would call first bc inventory turns over fast.
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