For buying a 30-30 two words come to mind.
Chances are you will not have to go to more than one or two to find a decent used rifle at a fair price. Not bargain basement price, but fair. Chances are it will probably have a scope mounted on it already. If you do not like the scope on it then change it for one you do like.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.