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There is no absolute answer to this, but I'm going to start with the obvious for some humor: use money! Ok, so for some additional options:
1) Bartering is a wonderful method if it is available (for example, a mechanic might fix my car and in turn I do his taxes).
2) Use a credit card that offers some incentive, like cash back, air miles, etc.
3) Use coupons, special offers, and other discounts whenever available.
4) Pay in accordance with terms, such as 2/10 net 30, which means you get a 2% discount for paying within 10 days and otherwise the due date is 30 days.