Home processing 8mm film is possible but awkward. Unlike 35mm film, which can be loaded into a developing tank inside a changing bag, you really need a darkroom and specialist equipment. (Which is expensive and hard to find).
Also, processing 35mm print or slide film only requires the film to be passed through two or three different chemical baths. I believe that Super 8 requires 14 different baths, all of which have to be temperature-controlled to an accuracy of about 0.1C.
Commercial processing might be impossible to find. Kodak offered this service, for Super 8 film only (not Standard 8) up until the end of September this year. The service has now been withdrawn. (It was very expensive anyway, at �7 per cartridge, which only gave you a few minutes of film). Other firms which advertised the service (such as the Wide-Screen Centre) seemed to be simply acting as agents for Kodak's Swiss lab. (i.e. the withdrawal of Kodak's service would seem to mean the end of all commercial processing of the film).
The fact that Kodak has withdrawn their processing service would seem to suggest that, if they've not already ceased to make 8mmfilm, they'll probably do so soon.
Chris