Tobias's Crafting Shop is an underground black market managed by Tobias Frewer. It is located in The Loop within a homeless camp under the freeway, to the north of the Bunker, and can be accessed after One Foot in the Grave.
Approaching the armored door and Tobias will show up offering eight useful crafted devices for Aiden to buy, eliminating the need to find components to craft devices himself. Clara says that DedSec members regularly buy supplies from Tobias.