Tom Clancys The Division has a variety of different vendors for Weapons, Gears and Weapon/Gear Mods that are scattered throughout the world map. These vendors also have a stock that refreshes after a set amount of time so it is highly recommend to keep visiting them in order to get the new stock from them. While you will be able to find plenty of weapons, gear and mods in the world of Tom Clancys The Division, you can also purchase them from vendors if you have the required credit for them. Below, you can find a map of each of the vendor courtesy of reddit.
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W = Weapons Vendor, G = Gears Vendor, M = Weapon/Gear Mods vendor. In addition to these vendors, you can also find some other vendors like the rewards claim vendor and the clothes vendor.