Old radio and Star Blazers
It looks like there are 50 episodes available. They also have some other interesting shows over there, if interested.
You can listen online or I assume download them as they are in the public domain.
The other night I couldn't find anything on TV that I found interesting so I started watching the live action version of Star Blazers also known as Space Battleship Yamato. I first heard about Star Blazers from a friend taking about it, and since it was space opera, anime, and SF I was interested. If these were aired on TV I missed them, and eventually ran into a VHS copy of the first program, and got hooked.
I'd never seen the live action version, but had heard about it. I think I checked with Netflix, but they didn't have it either. I finally ran across it on Youtube, and I was expecting something a lot more cheesy, but found it pretty well done. It has English subtitles, but there's not a lot of dialogue anyway.