Teddy bear (Fallout 3)

The Teddy Bear is a child's toy used for playing and by adults for collecting and decorating their homes. Teddy bears are made of a soft light colored fabric, filling, and lots of love.

Unmarked quest: Toys for Tots
With The Pitt add-on, you can trade Teddy Bears for 30 caps and 10 XP each with Sandra or Midea, depending on which side you chose during Free Labor.

Video
How to get the Legendary Teddy Bear from SatCom Array NN 03d (Note that, although this video claims that you need 15-20 frag mines and the BB gun, it's enough to drop four frag mines, or possibly less, on the lab desk and shoot them from a distance with your normal small gun. Retry until you succeed.) l8gkhCmWvts