If you have Internet service, YouTube is a great place to find both new and old adventures of Superman.
For example, fans have created a series of Superman vs. The Hulk battles and they are quite good.
Also, the 1966 first TV animated series for the Man of Steel can be found on YouTube. Just search for Superman and 1966 or 1967.
Some Superman comic books have also been added to YouTube in various forms.
There's even 1960s Superman-related TV comedy/live action parody shows, like "Captain Nice" and "Mr. Terrific" found on YouTube, with many of their episodes. Terrible special effects, but good, campy fun.
Some "Six Million Dollar Man" episodes are also easily found on YouTube.
Only downside is that you have to watch most in parts.