I would recommend going with a scope over a Red Dot.I ordered a Leupold 4x28mm. On another forum I was given a few opinions from those who have used 4power handgun scopes.They recommended to get a 2x instead .I called and changed my order to a 2x Leupold.I asked a guy at work today the same question and he said go with a 2x.
Midsouth and Natchez has them for 219.99.That must be the going price. Midsouth,Natchez and BassPro have them for the same price.

Ruger Redhawk