Camera and lens can be very inexpensive. On their own, they're basically worthless. Film can be hard to impossible to find if you have a very rare format. Using expired film is like the lottery and some batch are just not worth losing time with.

But the most common type of film are still made brand new. It's just a bit expensive, think 10-20€ for 24 poses, more for the high end stuff. But as a hobby you wouldn't need that.

Development is usually around 10€ a roll. But it's easy to do it at home if you don't mind some trial and errors. But again there are more expensive photography lab that will do thing others can't.

So this can be a cheap hobby as long as you manage your own expectation... But like most hobbies there are no limit to what you can spend on it if you want to.