Bobblehead - Barter

Bobblehead - Barter is a miscellaneous item in Fallout 3. It permanently improves the Lone Wanderer's Barter skill by 10, up to a maximum of 100.

Location
It is found in the Evergreen Mills bazaar, in a dark cave-nook, in the corner of the room to the right of Smiling Jack. Jump over the workbench, and it's on the rightmost shelves.