You first need to decide on the type, size and options of the car you would like (such as manual, automatic windows, airbags).

You then need to decide what the car dealer has to pay for the car of your choice - the "invoice cost". The difference between the sticker price and the invoice price can be negotiated.

You can obtain this information two different ways. The best way is to look at an auto pricing service supplied by a consumer group or an auto magazine. For instance, Consumer Reports New Car Price Service (http://www.consumerreports.org/cro/car-prices-build-buy-service/index.htm), will give you details of the invoice price and the sticker price that can be adjusted for options or rebates as well as tell you how to use the data for negotiating. This is the best way because it gives you the most recent information.

Another way is to use pricing guides that can be found on the Internet. Two popular sites are Intellichoice (www.intellichoice.com) or Edmund's New Car Prices (www.edmunds.com). You may also be able to obtain these books at the library and they will give you an idea about the information that you need instead of exact data.

If you have a trade-in, you will want to find the value of that car too. You can use the N.A.D.A. Official Used Car Guide (check your local library or www.nada.org) to look up your used car.

Now it's time to begin negotiating with dealers. Because you know the invoice price, you can use that information to bargain for the lowest mark-up from the dealer's cost.

An amount like $300 to $500 above the dealer's cost is a sensible mark-up, unless the car you want to buy is either difficult to get or very popular.

Any attempts by the dealership to sell you rustproofing, undercoating, or other extras should be refused. You may want to invest in an extended warranty, depending on the model's repair history.

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Source: Thomson Reuters