User blog comment:JmLyan/Caela, the Voice of Heaven/@comment-24420226-20160212195907/@comment-7481207-20160213110407

Between Sorcerer's Shoes, magic penetration runes, the magic penetration mastery and Wit's End, there are a few magic penetration options for non-AP champions (the latter which is also a somewhat supportive item), none of which are particularly expensive.