1. Being an inflexible traveler. You’ll save a lot of money on travel if you’re willing to be flexible. Consider traveling before or after peak season when prices are lower. Or search for flights over a range of dates to find the lowest fare. Booking at the last minute also can save you money because hotels and airlines slash prices to fill rooms and planes. And flexibility pays off at blind-booking sites, such as Priceline or Expedia, which offer deep discounts if you’re willing to book a room or flight without knowing which hotel or airline (or other details about the flight) you’re getting until you pay.

2. Sticking with the same service plans and the same service providers year after year. Hey, we’re all for loyalty to trusted service providers, such as your bank, insurer, credit-card company, mutual fund, phone plan or cable plan. But over time, as prices and your circumstances change, the status-quo may not be the best deal any more. Smart consumers are always on the lookout for bargains.

3. Making impulse purchases. When you buy before you think, you don’t give yourself time to shop around for the best price. Take the time to compare prices online, read product reviews and look for coupons when appropriate.

Make it a policy to give yourself a cooling-off period in case you’re ever tempted to make an impulse purchase. Go home and sleep on the decision. More often than not, you’ll decide you don’t need the item after all.

4. Dining out frequently. Spending $10, $20, $30 per person for dinner can be a huge drain on your wallet. Throw in a $6 sandwich for lunch every day and you’ve got quite a leak. Learning to cook and bringing your lunch from home can save a couple hundred bucks each month. When you do go out, consider getting carry-out instead of dining in (you’ll save on the tip and drink), skip the overpriced appetizer and dessert, and search the Web for coupons ahead of time.

5. Trying to time the stock market. In trying to buy low and sell high, many people actually do the opposite. Instead, employ the simple strategy of “dollar-cost-averaging.” By investing a fixed dollar amount at regular intervals, you smooth out the ups and downs of the market over time. If you take out the emotion and guesswork, investing can become less stressful, less wasteful and more successful.

6. Buying insurance you don’t need. You only need life insurance if someone is financially dependent upon you, such as a child. That means most singles, seniors or kids don’t need a policy. Other policies you can probably do without include credit-card insurance (better to use the premium to pay down your debt in the first place), rental-car insurance (most auto policies and credit cards carry some coverage), mortgage life insurance and accidental-death insurance (a regular term-life insurance policy will do the trick).

7. Buying new instead of used. Talk about a spending leak — or, rather, a gush. Cars lose 20% of their value the moment they’re driven off the lot and 65% in the first five years. Used models can be a real value because you can get a car that’s still in fine working order for a fraction of the new-car price. And you’ll pay less in collision insurance and taxes, too.

Cars aren’t the only things worth buying used. Consider the savings on pre-owned books, toys, exercise equipment, children’s clothing and furniture. (Of course, there are some things you’re better off buying new, including mattresses, laptops, linens, shoes and safety equipment, such as car seats and bike helmets.)

8. Procrastinating. Time is an asset money can’t buy. Start investing for retirement as soon as possible. For instance, if a 40-year-old saves $300 a month with an 8% return per year, he’ll have $287,000 by age 65. If he had started saving 15 years earlier at age 25, he’d have more than $1 million.

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