One of the cheapest places to buy software is eBay, where merchants sell programs that come directly from manufacturers, saving them from paying a markup to distributors.

But it may also be a risky place to shop, as it can be tough to discern good values from scams.

Consumers Union—which tracks Web retailers and advises consumers on Internet shopping through its ConsumerWebWatch.org service—urges buyers to use common sense.

“If it sounds too good to be true, it is,” says Beau Brendler, director of Web credibility for the site.

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