1) Eat roadkill. It's free and full of tarmacy goodness and essential rubber.
2) Distill your own moonshine. It's much cheaper and more potent than legal alcohol.
3) Sell your moonshine for a profit.
4) Relationships are expensive, especially if you are a man. Refrain from them, unless the other party happens to come from a wealthy background.
5) Identify students weaker than you, then threaten them into giving you their lunch money.
6) You can save a lot of money by pirating all your TV shows, movies and music.
7) Consider becoming an actual pirate and go out plundering gold and jewels on the high seas.