Armored Widow drops: creep tooth, earth wisp, elvenite, expansion permit, fur, jewels, light armor, wisp lantern
In my option it is NOT worth it. Maxotaur is FAR better.
Armored Widow mostly drops stuff you are maxed out on - mostly being glorified earth wisp + jewels dropper. It has 24 h timer, so the chance to get expansion permits this way is ultra small.