Fujifilm has been making its instax cameras since the late 1990s now, but the popularity outside of Japan has been slow progress. I still remember back in 2009 when I had to order my brown instax mini 7s directly from Japan via an ebay seller.
Thankfully the global popularity of these cameras has significantly risen and they are now (easily) available from most stores that deal in photography. Of course I can’t speak for other countries, but here in Belgium most photography stores as well as bigger chains such as FNAC and MediaMarkt at least carry one, and often several, of the available models (7s, 8, 25, 50s or 90 NEO CLASSIC and then the wide version) as well as film for these cameras. Prices, however, vary greatly from store to store, so it’s best to take some time to look around so you can find the cheapest option.