I was amazed to see that Super 8 film is still readily available made from existing types of film stock.
Kodak is somehow trying to keep its movie film business alive - and it was able to get some big titles shot on film, some directors like J.J. Abrams does like the look.
At the same time it made available again some Super 8 films - some schools find it useful to teach shooting on film with cheaper equipment, and some artists and enthusiasts like it for the retro look like in this movie. Just the first films made available were negative ones - Kodak does scan them but can't be projected directly. Now there's an Ektachrome film as well for a full retro experience.
Still AFAIK none of the new films has the magnetic strips for sound - it has to be recorded separately and synced. Just AFAIK the costs for development and scanning doesn't make this a really cheap option, just for the fun of re-using some old equipment you have. Yet I still have my late father's Nizo camera, and may be tempted to run some film through it...