The death of film is greatly exaggerated. Many places still carry film. The drugstore near you may even have a couple of rolls on the shelves. Your local camera shop, if your city has one, may have a selection of available rolls of film. Increasingly, online sources are convenient and have more selection.
B&H Photo has a wide selection of films at reasonable cost, plus chemistry and photo papers. So does
Adorama. In the UK,
SilverPrint sells worldwide, not only films but chemistry and more. In the USA, the Photographer's Formulary sells just about every combination of chemistry a photographer would need.
Ultrafine Online sells a variety of films, some hard to get such as Maco and their own line of
high contrast Ortho Litho film. Of course, the
Japan Camera Hunter blog sells items in Asia, including his own JCH StreetPan film.
Fuji Instax film, it seems, can be purchased anywhere cameras are sold, including big box electronics shops, pharmacies or just about anywhere. Of couse, how can one mention Instax without mentioning Impossible Instant Film.
In short, there seems to be a plentiful number of sources for getting film, film chemistry and papers. The variety and pricing of which depends on how far you are willing to search for what you want and at what price. Not only do prices vary, but shipping varies also and some online shops offer free shipping over a certain amount. It may be cheaper when buying online to buy 10 rolls and save with free shipping than to buy a couple of rolls of film at a time.