Because a penny saved is a penny earned.
2) Earing more money. Increase your income by any (legal) means necessary.
3) Winning Money. Completely unreliable. But it's nice when it happens.
4) Government money. This is almost as hit or miss as winning money, but the good tax return every now and then doesn't hurt (me. right now. **trying really hard not to think about the national future**)
5) Gifts. Christmas and birthday gifts of cash (or returnable items) should never be discounted.