Are there any pre-pay car rental programs?

Avis, Budget, Hertz, and Alamo offer prepay car rental deals on their websites. Enterprise and National do not. Dollar and Thrifty only offer them internationally. Alamo caps its discounts at 10%. Current Avis.com and Hertz.com discounts stand at around 15%. Discounts don't apply to extras like GPS systems and insurance, or to promotional offers.

Monday, February 06 2012
Source: http://travel.usatoday.com/digitaltraveler/story/2011/05/Plan-and-save-with-these-pre-pay-car-rental-programs/46609788/1