It's a little unclear whether you're looking for information ABOUT those guns or actually looking to BUY them. As with any "collectible", you have to do your research: learn about the different basic types, the various manufacturers in the various countries (as you've seen from the other posts, the 1911, HiPower and Luger were all made by several companies in various countries ... in some cases on both sides of the war); from there you get into the various identifying markings, "proof marks", serial numbers, etc. Real WWII guns ... actually made or used during the war ... are premium-priced these days. Some collectors are only interested in pristine examples, or particular guns with a known history. Those tend to be pricey. To see some actual guns for sale, take a look at
www.GunsAmerica.com, look at "Misc Military" (there are several sub-categories). Also, take a look at "curio and relic" guns; a lot of the older models fall into this category (which, if you have a special license, which isn't too hard to get, you can buy more easily). I'm sure that, as you poke further around the web, you'll find more specialized sites that address particular types. Good luck.