Hope you got a flat top---not one with a carry handle rear sight.
Natchez Shooters Supplies is a good place to buy scopes. They have a good selection, good prices, and good service. (They're in Tennessee not in Natchez, MS.)
They carry "refurbished" scopes but I have never tried one.
Here is a link:
Your budget will control your selection. "Cheap" is not necessarily "bad". But "too cheap" (under $150) is likely to get you a lousy scope. On the other hand, you probably would not see much difference between a $400 scope and a $1200 scope.
You will also face the dreaded "choose rings" issue.
I have used Burris Signature Zee rings and like them because they have plastic inserts that prevent scratches on the scope and allow you to make major adjustments by changing the inserts. But they are more expensive (around $35) and harder to find than plain jane rings.
But you also have to get the correct height rings for the scope, of course.