BJ’s Wholesale Club offers a webpage of car rental discounts.  A series of coupons are up-to-date on the link below that offer free car upgrades and more.  It is an amazing savings.  First – you use the BJ’s club ID and receive a discount.  Then you apply the coupon and get an added bonus.  I regularly use these coupons when I travel to Orlando.  On my family golf trips, I typically get a mini-van thru Alamo which is large enough to carry all the clubs.  $179 for the week using these discounts cannot be beaten!  I would assume that you have to be a BJ’s member to use the coupons, but I have used them regularly without any question as to whether or not I was a member.

http://www.bjsvacations.com/promotion/bjs/carrental/default.asp

The Buyers Edge Club offers rental discounts for Enterprise Rent A Car.  Many companies offer this as a perk and this can offer a significant discount.