I have been frequently renting cars during the weekends for the past 2-3 months and i always try to do multiple searches using the following options: 1. Hotwire 2. Chase UR portal 3. Costco Travel 4. Priceline For 80% of the time, i have found costco travel rates with Budget (followed by Alamo or Avis) to be the cheapest of the lot. The savings are quite considerable and one can even save close to thousand dollars over a year or so. Once i did the booking through Chase UR portal where i found it chepest and once through priceline bidding when i found costco travel rates to be higher. All these in comparison to the lowest rate offered through hotwire. 1. The biggest advantage i found with costco travel is you can cancel it any time you want. They dont charge your credit card until you rent the car. 2. One notable data point is that i always have found the rates drop closer to the day of actual rental. 3. The biggest rate drop i have seen is on mondays compared to sundays, during the week of rental. 4. It is better to keep checking the website every day for rate drops until the actual day of rental. I personally love costco travel and i think costco members planning to rent a car should give it a try. Even i get a feeling that Budget gives priority to Costco travellers. Ensure that you are registered for fastbreak and you might start wondering at the service levels you start receiving. All the best.