Autoslash.com Promises to keep track of your rental car reservations from other companies and send you an email when they find the rate has dropped. Now I have tried this before and it did not work. I think this time I will book multiple car levels to ensure it tracks all price drops. Alamo is notorious for dropping the rate of the fullsize and above car rates below economy at times, which can work out to be a great deal. But if autoslash is only watching my rental rate on an economy car, I will not be notified. So I will give this a try and report back my results. If anyone else has any rental car discounts or methods they use, please comment below, the good ones never seem to last long!