My favorite is the Leupold 2 1/2 fixed power. If you search around, should be able to find one for a bit over $100 if you are lucky. LOTS of eye relief, big field of vision, and life-time warranty. And, since more then likely, it will not be used on long-range gophers, it offers plenty of magnification for the purpose of the cartridge. Or, look for a similar Refield, or early, U.S. made Weaver in similar power ( a Weaver 3X would also be really nice ).
Mark