There’s an abundance of heroic deals to be had, especially for titles that are not on DC Universe, such as:
-Lex Luthor: A Celebration of 75 Years ($29.99 regularly, on sale for $5.09)
-Lois Lane: A Celebration of 75 Years (same price as above)
-Superman: A Celebration of 75 Years (again, same price)
-all of the Superman: Earth One original graphic novels
-the first volumes of Superman and Action by Bendis
There’s also a super amount of single issues on sale too (less than a buck each, by jove!), including all but the most recent issue each of Action Comics and Superman.
There’re also single issues on sale that can be found here, but it’s worth a mention for anything you’d like to own. Plenty of cheap trades too.