5 out of 5
Airports can be convenient if you are flying into the city. However, they are also more expensive than other locations around town. Higher prices are because the airport itself charges a fee to the rental company. The rental company then passes this fee onto the customer.
Costco has negotiated with the major car rental companies to have discounts on rentals. Costco membership is one of the most accessible group rates to be a part of because Costco membership has so many other benefits.
There are discounts negotiated for employers, AAA, and various professional organizations. One example of a professional organization that has deals is AIA for architects. They have value through Hertz.