Yeah, guess that was also a consideration if I'd be best to hunt down and travel to an actual gun show rather than the convenience of an online site. I just wasn't sure how effective I'd be finding the right models at brick-n-mortar events near me versus online searching the entire country.
I'm an old gun guy, have a pretty good collection, including some of the rifles on your list.
Online is a good place to find the "Going Rate" for these type of guns. But Prices/Quality vary WIDELY. Sadly, some people misrepresent their rifles, on quality, and originality. Screw jobs are out there, so watch out. Research is vital, to know exactly what you are looking at, and there is nothing like having it in your hands, before ya throw down the $$$. There are so many variables to consider, like do you want a well patina'ed genuine wartime piece with all original period parts as a wall hanger, or a functioning shooter?
There are a lot of "put togethers", meaning rifles rebuilt and refinished from vintage parts. Are they "Original"? NO, not exactly, but neither is the price. Their advantage, you can shoot them all you like, with no worries of damaging a genuine historic artifact. Some are very well restored using genuine vintage parts, are nice to look at, and shoot quite well. For most people, that is good enuf.
Just depends on what you are seeking. It's a fun hobby, good luck and happy gun shopping,