AAA for cheap car rentals
They're often coming up cheaper than the competition for most major U.S. cities, especially right now that rental car capacity has been cut so much by the major car rental companies.
As AAA isn't included in the meta search engines like Kayak.com, CheapTickets.com, or Orbitz. That means these rates are only visible on AAA's website, so fewer travelers are aware of the great deals the organization offers.
The savings are large enough that a year's membership with AAA will more than pay for itself from a single rental period.
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