I want to get a scope for my 870 this year but dont know what to get that I can shoot deer that are running when doing drives and that I would not pay over $100 and that dont fog up to
Some form of red dot would be best for running short shots. For a scope for shotguns that won't break the bank but still is a decent enough scope, try the Simmons Pro Diamond recticle.
I have had a scope before and since have gone back to open sights. I have also ha had the red dot and since went back to open sights. As for a scope buy a Leupold Scopesor a swarovski. Anything else is junk. As for fog they make a liquid solution that you can put on scopes. If you buy something good you dont need to worry about it.
a scope and running deer sounds like a bad combo. id stick with a good set of fiber optic or ghost ring sites with some oo buckshot. if you insist on a scope the banners get the thumbs up from me. get the one with the circle "x" reticle.