I've just discovered that the complete Ellery Queen Mysteries series has recently been been released as a 6 disc DVD box set! The box contains all 22 episodes plus the pilot "Too Many Suspects".
I used to watch this as a kid in the mid 70s but have never had a chance for a re-visit so this is pretty cool. I have no idea if the show holds water or if I'll still like it but I'm definitely gonna order it.
Someone on Amazon.com wrote an informative review, you can check it here.