Seems like most hobbies are pretty darn expensive which is not surprising, aka ya gotta pay to play.

I use to play golf but now have a bad back.
I use to ride motorcycles but feel like it's too dangerous now for ME (JMO) due to distracted drivers.
I still go fishing, tried fly fishing and still think about trying it again.
Now I tinker around with guns, I really seem to enjoy the load development process, trying to find a good load for a rifle. I prefer rifles over handguns so I don't reload for handguns.
I shoot ARA matches at my local gun range.

So far all of the above are fairly expensive or worse to get started in.

What cheap/inexpensive hobby have you discovered? I've not really found any that interest me yet

I consider myself a "master piddler", I just piddle around the house at times doing things, tinkering around, but I usually end spending some coin because I think of a better mousetrap for that particular area, or I break whatever I was piddling/tinkering with and have to replace it.