Weapon Mod stocking is random, so there's no guarantee you'll get the one(s) you want on any given visit, but between Hannibal's list, the arms dealer (not Alexander, he never has them in my experience) at the 188 Trading Post, the Khans' armorer (shop is in the storm cellar of the trashed house just outside Red Rock Canyon), and Lacy at Mojave Outpost you should be able to find at least a couple on any given pass through the lot of them.
Note that doing so will reset the game-calendar to Sunday, potentially causing the vendors on the whole to miss a restock date. A spin-off of the Fallout series, the game is set in a post-apocalyptic open world environment that encompasses a region consisting.
If this happens you can try saving in front of him and then exiting the game completely (main menu may suffice) and reloading, which should force his container to restock. Fallout: New Vegas is a 2010 post-apocalyptic action role-playing video game developed by Obsidian Entertainment and published by Bethesda Softworks.It was announced in April 2009 and released for Microsoft Windows, PlayStation 3, and Xbox 360 on October 19, 2010.
One thing about Crimson Caravan: Blake's vendor container has a habit of not restocking, despite being in the vendor container cell which resets on Sundays and Wednesdays.
