Everyone with a cause is sending me e-mail and a banner. Serving unpaid ads can be fairly inexpensive, Garcia said. For portals such as Yahoo or Microsoft's MSN, which use proprietary ad servers, the costs can be next to nothing, Garcia said. Web companies using third-party ad servers, such as DoubleClick's DART or L90, can pay anywhere from 25 cents to 35 cents per 1,000 impressions, or appearances of the ad. She also said that offering free ad space to nonprofits could present a tax break as well.
Newspapers get to write off a certain amount of money if they give advertising to a nonprofit.
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