I'm on second playthrough of Dead Money right now, and on my first one I didn't bother to look for the hidden vendor codes, weapons, Dean's Stashes, snow globe, etc. and I would really appreciate it if someone (or multiple people) could give me locations of all/most of these, mostly the vendor codes and snow globe. Thanks.

http://fallout.wikia.com/wiki/Fallout_Wiki

Yes, I realize that exists. But that doesn't show the location of every single one nor does it show every single vendor code.

Pretty sure it does. And let's just say it didn't, which ones doesn't it show? If you already know which ones it does not show (somehow), just take the ones it does show and you now you know where they all are. But that's not the case is it? More likely, you're too lazy to bother to look for them in the game, and even further, too lazy to bother to look for them on the wiki.