I still shoot film and only use Nikon. The beauty of Nikon is they never change their lens mount. You can buy an older body and newer lenses will work with them. You make not get all of the features like stabilization control, but the autofocus will work. You should also be able to get good used lenses from the 1990's and 2000's with autofocus that will work on the 8008, N90, F4 and F5. I use an 8008 from the 1980's and an N90 from the early 1990's. If I get back to shooting more I will probably pick up a used F4 or F5 which were considered their pro model film cameras. I only shoot black and white and color transparency (slide) film. No color print film.
I would look at KEH they have a good reputation -
https://www.keh.com/
You can also try B&H photo in NYC. They only have one Nikon right now an F5 with motor drive for $500.
https://www.bhphotovideo.com/c/brows...1/N/4294247179. I buy a lot of storage material from them, negative and slide pages and archival storage binders.
Another one is adorama -
https://www.adorama.com/Used. They current have an N90S body for $39. I use one now.
If you are looking for film you may want to look at Freestyle photo -
https://www.freestylephoto.biz/ They sell a lot of great Eastern European b&w film. If you want slide (transparency) film you should be able to find it at all of the above and other places. There are also labs that will develop for you.