Cheap hobbies?
Yeah, shooting is getting expensive, and my boys' feet are still growing, dress code says they can't go to school without shoes.
Lots of reading, lots of free ebooks from Amazon. Don't like it a chapter into the book, just delete, it was free!
Current "hobby" is stripping and scraping wallpaper off plaster walls in my 80 y/o house. Right now working on the hallway (took a break to read the forum) with at least 6 layers of wallpaper, second layer is painted. Love my 5-in-1 tool and steamer!
Bought a scanner last year, have tons of photos, negatives, and slides to scan into the computer. Good project for a rainy day or Sunday afternoon.