This page has a lot (a ton!) of images of different cassetes. Cool!
The above is an image of a russian cassete that was made in Moscow at a factory called "Gram zapis" and was sold for 3 roubles, 25 kopeks. Not that you care, but now you know.
Below is another russian casette. This one was made in 1981 and went for 4 roubles.
Seeing these brought back some interesting memories of bootlegged western music.