Guns, Dogs and Blades QnA

Last year I went and visited my old platoon sergeant from my 2nd Iraq deployment. He gifted me a Ruger AR10 which is pretty much brand new. I got a bipod for it but I’m still using the iron sights. I wanna get a nice scope for it like an Acog, there some other scopes not so expensive? This is just a hobby of mine. Thanks Dustin