Juggling, anywhere from $3 to $15. Juggling is a great way to develop hand eye coordination that can considerably enrich the rest of your life. It is easy to learn but challenging to become good. To start juggling just look up a YouTube video or online guide, take what you learned there and practice whenever you have time. You can learn how to juggle with real juggling balls, golf balls, or even a few oranges!
Rubik's Cube, $10. This is easily one of the best hobbies I have ever had, and you can expect me to write on this subject extensively. After your ten dollar purchase there is a whole new world open to you, and if you ever feel like going further into this new world you will find it can be a never ending adventure. Learn how to solve this puppy and you have hours upon hours of fun, and your always getting faster. There are hundreds of different Rubik's cube like puzzles, most of which cost much less than the original cube. Wow your friends and family members by becoming one of the few, the proud, the nerds.
Weight Lift, $5 a trip to the gym or about $30 a month. There are two kinds of weight lifting goals. Strength training and body building. Strength training is lifting in order to become stronger, body building is making your muscles larger and more beautiful. Make sure you do some research before you start any new workout regimen and consult your doctor.