I still think your return on investment would increase dramatically if you could find a way to bump it up to $250 or so. If not here are some recommendations.
have bought 2 guns in the last couple of years for $100 or less and I am happy with both.
A used NAA mini 22lr ($99)
A Spanish copy of a Colt vest pocket $25acp ($70)
Also look at a used Heritage Rough Rider revolver in 22lr/22mag. They can be found new for under $200 so maybe you could find one used at your price point.