This is my second play through of New Vegas and somehow I don't remember where I got the scoped guns I had before from. The only scoped gun I remember is a Guass Rifle which I only got because of the fight with the Brotherhood with Veronica. (which I probably only survived at the time because I had the Pulse Gun)
Where can you find a scoped rifle? Also, I keep checking stores such as Gun Runners but they never have a scope attachment(except for pistol scopes sometimes)
Best Answer
Chances are you can pick up a (hunting rifle) scope at the 188 Trading Post on your way into Vegas (cheaper than Gun Runners anyway!) - according to the Fallout wikia page, there's not that many places to get one.
If the hunting rifle isn't your cup of tea, the laser rifle scope can be found at a variety of places - Novac, Crimson Caravan's camp, or the Silver Rush in Freeside (to name a few): Laser Rifle scope.
All of these locations are potentially visitable in your early game.
Also, this search result is invaluable if you are looking for scopes for anything that shoots.