Just picked up...

Volume 3 at a Dollar store in CT. They had two more volumes, I think 4 and 6. The quality is surprisingly good.
One laugher, the animation used is primitive. Besides the superimposed mouth, when they are moving in a car or train or plane, the vehicle stays still and the background moves behind it. The foreground picture of the vehicle is apparently drawn on a sheet of transparent plastic then placed on another sheet of glass or plastic. You can see that there are bubbles where the foreground picture was 'adhered' to the glass and they didn't squeegee the air out of it.
Also to avoid having to put superimposed mouths on all characters, some have beards and bushy mustaches to hide their mouths.

There were several episodes on the dvd.

I loved them!